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EFSA Journal logoLink to EFSA Journal
. 2020 Apr 28;18(4):e06114. doi: 10.2903/j.efsa.2020.6114

Update of the Xylella spp. host plant database – systematic literature search up to 30 June 2019

European Food Safety Authority (EFSA)
PMCID: PMC7448098  PMID: 32874307

Abstract

Following a request from the European Commission, EFSA was asked to create and regularly update a database of host plant species of Xylella spp. In 2018, EFSA released a new Xylella spp. host plant database that was now updated with informative data extracted from 76 recent publications retrieved through an extensive literature search. This report is related to the third version of the database published in Zenodo in the EFSA Knowledge Junction community, covering articles selected from: a systematic literature review conducted up of 30 June 2019; Europhyt database up to 15 October 2019; and relevant articles identified by EFSA Horizon scanning and personal communications from experts. Some data on Xylella fastidiosa strains and geographical coordinates included in the already published database were updated or modified with the purpose of increasing the accuracy and consistency of the database itself. Thirty‐seven new host plant species of X. fastidiosa, identified through the data extracted from the selected publications, have been added to the database. Those plant species were reported as naturally infected, artificially infected or infected under unspecified conditions by subsp. multiplex, pauca or unknown (i.e. not reported in the publication) subspecies of X. fastidiosa. No additional data were retrieved for Xylella taiwanensis. Six new Sequence Types (STs) have been identified in Brazil, Italy and the USA. Information on the tolerant/resistant response of plant species or varieties to X. fastidiosa infection are also reported in the database. The overall number of Xylella spp. host plants reaches now 343 plant species, 163 genera and 64 families determined with two different detection methods, till 595 plant species, 275 genera and 85 families regardless the detection method applied. The EFSA database on Xylella spp. host plants is updated regularly with the aim to provide information and scientific support to risk assessors, risk managers and researchers dealing with Xylella spp.

Keywords: Xylella spp., Xylella fastidiosa, host plants, database, data extraction, subspecies, sequence types

1. Introduction

1.1. Terms of Reference as provided by the requestor

In the context of Article 31 of Regulation (EC) No 178/2002, EFSA was asked by the European Commission DG SANTE to provide technical assistance in the field of plant health as regards the regulated harmful organism Xylella fastidiosa, as per letter to EFSA's Director dated 30th June 2016 (Reference ARES(2016)3126989).

EFSA was requested to further specify and update the host plants database of X. fastidiosa available in 2016 (EFSA, 2016) taking into account the different X. fastidiosa subspecies and strains (with particular reference to the European isolates), with the inclusion of information on non‐susceptible plants and varieties and negative results of diagnostic tests when available. EFSA was requested to maintain and update this database periodically and to make new releases available on the EFSA website, together with a scientific report. Such report should specify the list of plants confirmed to be infected by at least two detection methods in field conditions or via vector transmission under experimental conditions and be published at least annually, or according to needs following agreements between EFSA and the European Commission. Such request is for the period 2016–2020.

1.2. Interpretation of the Terms of Reference

Following this request, European Food Safety Authority (EFSA) delivered in September 2018 a renovated and updated database of host plants of Xylella spp., taking into account both species of the genus Xylella (X. fastidiosa and X. taiwanensis) (EFSA, 2018). A systematic approach was applied according to the EFSA guidance on systematic literature review (EFSA, 2010) and detailed information on host plants, infection methods, geographic location, pest genetics, detection techniques and host status were collected from more than 850 references. The data structure of such database was renewed in order to improve consistency and transparency, and raw data and interactive reports were published in Zenodo1 in the EFSA Knowledge Junction community and in Microstrategy2 platform, together with a Scientific Report.

As per Terms of Reference (ToR), EFSA was requested to maintain and update the Xylella spp. host plant database periodically, and to publish new releases online together with a report. This Scientific Report provides an update on the database of host plants of Xylella spp. published in 2018 (EFSA, 2018). An extensive literature search was conducted to retrieve recent publications on the topic and new informative data on host plant species of Xylella spp. were collected. Such report provides information on the literature review and a detailed view on the currently known host plants of Xylella spp.

2. Data and methodologies

The methodologies developed for the Xylella spp. host plant database published in 2018 (EFSA, 2018) were applied in this report.

The process was divided in the following steps:

  • Extensive literature search to identify relevant references.

  • Selection of studies based on title, abstract and full text.

  • Data extraction of relevant information.

  • Update of some data already inserted in the Xylella spp. host plants database published in 2018.

  • Data analysis and reporting.

2.1. Extensive literature search

The review question ‘Which plant species can host Xylella/Xylella associated disease?’ was broken down into key stages using the P/O conceptual model described in the EFSA systematic review guidance (EFSA, 2010):

  • Population of interest (P)

The population of interest is that of plant species, worldwide.

  • Outcome (condition of interest) (O)

The outcome (condition of interest) is that of Xylella spp. infection.

Two main elements were considered for the extensive literature search: the sources of information (Table 1) to be consulted and the search strategy (Table 2).

Table 1.

Sources of information

Database Platform
Scopus Scopus
BIOSIS Citation Index Web of Science
CABI: CAB Abstracts®
Chinese Science Citation DatabaseSM
Current Contents Connect
Data Citation Index
FSTA® ‐ the food science resource
KCI‐Korean Journal Database
MEDLINE®
Russian Science Citation Index
SciELO Citation Index
Web of Science Core Collection
  • Science Citation Index Expanded

  • Social Sciences Citation Index

  • Arts & Humanities Citation Index

  • Conference Proceedings Citation Index‐ Science

  • Conference Proceedings Citation Index – Social Science & Humanities

  • Book Citation Index – Science

  • Book Citation Index – Social Sciences & Humanities

  • Emerging Sources Citation Index

  • Current Chemical Reactions

  • Index Chemicus

Zoological Record

Table 2.

Search strings and results

Platform Query Results
Scopus (TITLE‐ABS‐KEY (xylella OR xyllela OR xylela OR (pierce* W/2 disease) OR (((plum OR plums) AND “leaf scald*”)) OR ((phony W/2 (peach* OR disease*))) OR ((citrus AND variegat* AND chlorosis)) OR crespera OR “almond leaf scorch*” OR “bacterial leaf scorch*” OR “coffee leaf scorch*” OR “mulberry leaf scorch*” OR “oleander leaf scorch*” OR “sycamore leaf scorch*” OR “Periwinkle wilt” OR “Ragweed stunt” OR ((olive W/50 “quick decline syndrome”)) OR “Xylem inhabiting bacteri*” OR “Xylem limited bacteri*” OR fxib OR fxjb OR “rickettsialike bacteri*” OR “rickettsia like bacteri*”)) AND (ORIG‐LOAD‐DATE > 20170930 AND ORIG‐LOAD‐DATE < 20190701) 160
Web of Science TS=(xylella OR xyllela OR xylela OR (pierce* NEAR/2 disease) OR (((Plum OR plums) AND “leaf scald*”)) OR ((Phony NEAR/2 (peach* OR disease*))) OR ((citrus AND variegat* AND chlorosis)) OR crespera OR “almond leaf scorch*” OR “bacterial leaf scorch*” OR “coffee leaf scorch*” OR “mulberry leaf scorch*” OR “oleander leaf scorch*” OR “sycamore leaf scorch*” OR “Periwinkle wilt” OR “Ragweed stunt” OR ((Olive NEAR “quick decline syndrome”)) OR “Xylem inhabiting bacteri*” OR “Xylem limited bacteri*” OR FXIB OR FXJB OR “rickettsialike bacteri*” OR “rickettsia like bacteri*”) 269

2.1.1. Information sources

The search strategy was run in all databases listed in Table 1 via the Web of Science (Clarivate Analytics) and Scopus platforms with no language or document type restriction.

2.1.2. Search terms

The syntax of the search string, developed for the Xylella spp. host plants database published in 2018 (EFSA, 2018), was adapted and run into each platform databases listed in Table 1 on 30 June 2019. As the scope of the search was to retrieve references published after September 2017, the selected time span was from 30 September 2017 up to 30 June 2019. The search strings and the number of retrieved references are shown in Table 2.

The collected records were downloaded and imported into an EndNote X9 library (Clarivate Analytics). Duplicates were removed using EndNote X9 and the remaining references were uploaded on DistillerSR online3 together with the full texts in portable document format (pdf).

Nine additional documents containing relevant information were obtained from research groups, personal communications of experts, EFSA Horizon Scanning for Plant Health4 and Europhyt outbreak notifications5 (accessed on 15 October 2019).

2.2. Study selection

The collected references were screened for relevance in two steps:

  1. Title and abstract screening.

  2. Full‐text screening of the references that passed the first step.

Inclusion/exclusion criteria were applied in each step and two reviewers worked in parallel screening the references.

The first step required the reviewers to answer two questions, listed in Table 3, considering only title and abstract of the references. The aim of this step was to select only references presenting original research data on Xylella or Xylella‐associated disease.

Table 3.

Inclusion/exclusion criteria for title and abstract screening

Question text Type of answer Answer text Exclusion criteria
Is Xylella/a Xylella‐associated disease/a Xylella synonym the topic of the study? Only one of the possible alternative answers can be selected Yes Included
No Excluded
Is it a primary research study? Only one of the possible alternative answers can be selected Yes Included
No Excluded

The references that passed the first step were submitted to the full text screening. This second step required the reviewers to answer to four questions (Table 4): three of them are descriptive (neutral) whereas the fourth has an inclusion/exclusion role.

Table 4.

Inclusion/exclusion criteria at full text screening

Question text Type of answer Answer text Exclusion criteria
Is an English abstract present? Only one of the possible alternative answers can be selected Yes Neutral
No Neutral
Which is the type of the publication? Only one of the possible alternative answers can be selected Peer‐reviewed article Neutral
Article Neutral
Book Neutral
Conference proceedings Neutral
Abstract Neutral
Technical publication/Report Neutral
Other Neutral
Is the Xylella host plant the main scope of the study? Only one of the possible alternative answers can be selected Yes Neutral
No Neutral
Is Xylella/a Xylella‐associated disease/a Xylella synonym studied in association to a host plant? Only one of the possible alternative answers can be selected Yes Included
No Excluded

2.3. Data extraction

Informative data listed in Table 5 were extracted from the selected references. For each reference, the first reviewer performed the data extraction whereas the second reviewer conducted the quality check of the extracted data.

Table 5.

Data extraction structure

Extracted data Description
General information In this section, the general information about the study is reported
RecordID Unique number allocated to each row
RefID Unique number allocated to each reference within the DistillerSR software
Reference Full reference
Publication year Year of the publication
Starting year Starting year of the study, as reported in the publication
Ending year Ending year of the study, as reported in the publication
Botanical identification The botanical identification of the plant, both as reported in the publication and according to the updated taxonomy of the EPPO Global Database 4 , is reported in this section
Plant EPPO code EPPO code of the plant species, from the EPPO global database.6 For plant species not present in the EPPO global database, a new code was created in the EFSA catalogue.
Plant family Plant family, from the EPPO global database4
Plant genus Plant genus, from the EPPO global database4
Plant species Plant species, from the EPPO global database4
Reported plant species Name of the plant species as reported in the publication
Common name Common name of the plant species, as reported in the publication
Cultivar Cultivar or plant variety, as reported in the publication
Infection information Detailed information about the infection and location of the plant is reported in this section
Infection method (Level 1) The infection of the plant can be natural, artificial or not specified
Infection method (Level 2)

Subcategories of natural infection: during survey activity, during research activity. ‘Research activity’ is used when plants are planted under natural inoculum pressure and infection development was monitored without interfering

Subcategories of artificial infection: mechanical inoculation (detailed at level 3a), vector transmission (detailed at level 3b)

Mechanical inoculation (Level 3a) Subcategories of mechanical inoculation: budding, grafting, needle, root uptake, stem absorption, syringe
Infection vector species (Level 3b) Insect species used in the artificial vector transmission
Location type The place where the plant was placed: natural habitat, greenhouse, screenhouse, interception, not specified
Geographic information In this section, the geographical location of the plant is reported, as detailed as possible. In case of intercepted plant, the reported location is the geographical origin of the plant and not the country and location where it was intercepted
Country code From the EFSA catalogue, based on NUTS (Eurostat) and GAUL (FAO) territorial unit nomenclature
Country From the EFSA catalogue, based on NUTS (Eurostat) and GAUL (FAO) territorial unit nomenclature
Location Location description (state/region/province/municipality) from the EFSA catalogue, based on NUTS (Eurostat) and GAUL (FAO) territorial unit nomenclature
Additional Location Additional information on the location, as reported in the publication
Coordinates precision Coordinates as reported in the publication
Latitude Latitude, as reported in the publication
Longitude Longitude, as reported in the publication
Pest description Information about the pest is reported in this section, together with genetic data
Pest EPPO code EPPO code of the pest, from the EPPO global database4
Pest species Name of Xylella spp., from the EPPO global database4
Pest subspecies Xylella fastidiosa subspecies, from the EPPO global database.4 If the subspecies is inferred from another publication, a note is added in the genotyping comment
Reported pest Name of Xylella spp. as reported in the publication (from 1930 up to now): Alfalfa dwarf virus, Morus suffodiens virus, Phony peach bacterium, Pierce's disease bacterium, Pierce's disease virus, Rickettsia‐like bacteria, Rod‐shaped bacteria, Xylella fastidiosa, Xylella taiwanensis, Xylem‐inhabiting bacteria
Disease Name of the disease caused by Xylella spp., as reported in the publication: Alfalfa dwarf, Almond leaf scorch, Bacterial leaf scorch, Blueberry bacterial leaf scorch, Citrus variegated chlorosis, Coffee leaf scorch, Crespera, Elm leaf scorch, Leaf scorch disease, Mulberry leaf scorch, Oleander leaf scorch, Olive quick decline syndrome, Pear leaf scorch, Pecan bacterial leaf scorch, Periwinkle wilt, Phony peach disease, Pierce disease, Plum leaf scald, Potato purple top disease, Ragweed stunt, Sweetgum dieback, Sycamore leaf scorch
Strain Name of the strain of Xylella spp., as reported in the publication
MLST (Multilocus Sequence Type) Sequence Type (ST) of Xylella fastidiosa, as reported in the publication. If the ST is inferred from another publication, a note is added in the genotyping comment
Genotyping comment Comment or additional information regarding the pest
Methods of identification In this section, the identification methods applied to detect Xylella spp. infection are listed. Eight detection methods were considered and for each of them, the outcome of the analysis (positive or negative), together with the number of infected plants and the total number of analysed plants, were reported. Moreover, additional information could be added in the comment column beside each detection method
Symptoms Observation of symptoms in the plant, as reported in the publication
Symptoms expression in test plants Observation of symptom development in test plants after an attempt to transmit the pathogen through vectors
Culture Isolation of cultivable bacteria from tissue samples on solid culture media
Microscopy Observation of Xylella spp. bacteria through microscopic analysis techniques
ELISA Enzyme‐linked immunosorbent assay
Other immunological techniques Immunological techniques other than ELISA
PCR‐based methods Polymerase chain reaction‐based methods (PCR, nested PCR, qPCR, etc.)
Sequencing Sequence analysis
Host status Information about the tolerance and resistance response of the plant
Tolerance/Resistance reported Tolerant/Resistant status of the plant, as reported in the publication
Tolerance/Resistance category Categories describing the response of the tolerant/resistant plant: lack of infection or negative reading, lack of systemic movement, lack or reduction of symptoms, lack or reduction of symptoms – lower bacterial population, lack or reduction of symptoms – lower bacterial population – lower disease incidence, lack or reduction of symptoms – lower disease incidence, lower bacterial population, lower bacterial population – lower disease incidence, lower disease incidence, infection not persistent, reported as tolerant/resistant (no details)
Tolerance/Resistance comment Comment on the tolerant/resistant response of the plant, as reported in the publication
Additional information
Comment Additional relevant information or comment on the study
Confirmed record ‘Yes’ for confirmed records, ‘No’ for unconfirmed/dubious records. Unconfirmed records were included in the data extraction but excluded from the data analysis

2.4. Data updated in this database version

Some information already included in the Xylella spp. host plant database published in 2018 were updated, with the purpose of increasing accuracy and consistency of the database itself.

References containing X. fastidiosa strains for which the subspecies was not reported in the publication were cross‐checked with other references in the attempt of identifying the subspecies to which the strain belongs. In some cases, the author of the reference was contacted to ask additional information on the genotyping of the strain. Whenever the subspecies was identified, it was inserted in the related record and a comment was added in the genotyping comment's column.

The section on geographical coordinates have been modified and updated. Column ‘Location’ includes the administrative location description according to NUTS (Eurostat, for EU countries) or GAUL (FAO, for the rest of the world) territorial unit nomenclature and more precise administrative information if available in the publication. Additional information reported in the publication, such as the research centre name or the experimental field station where the study was conducted, are specified in the new column ‘Additional Location’.

The geographical coordinates were inserted only when explicitly reported in the publication. Other geographical coordinates previously present in the database and inferred from different sources have been removed for consistency with the related documents and for avoiding misunderstandings in relation (e.g.) to extrapolated geographical features. For further information on the origin and on what exactly those coordinates are referred to, the publication should be consulted.

Records present in the update published in 2018 and containing information that have been afterwards updated (such as from Europhyt notifications, or from ongoing artificial infection experiments) have been modified with the most updated information and results.

2.5. Data warehouse

A harmonised data model has been established to collect data on Xylella spp. host plants. The aim was to establish a harmonised data flow for the collection and the collation of an extensive literature review generated data in the plant health domain. Data are stored in EFSA Scientific Data Warehouse (S‐DWH), after that an ETL (Extract, Transform, Load) procedure is applied in order to harmonise and calculated the statistics.

2.5.1. Data management

The collected data have been submitted to the EFSA Data Collection Framework (DCF). DCF is the upfront system in the EFSA pipeline of data collection tools and allows a first step of harmonisation against the EFSA controlled reference terminology (aka EFSA catalogues). Data have been then included in the S‐DWH by means of a standardised Extract Transform Load (ETL) procedure and they have been further analysed and managed to generate needed statistics.

Data are available as interactive reports on the Microstrategy platform at the following link: https://www.efsa.europa.eu/en/microstrategy/xylella

Raw data and related metadata are published in Zenodo in the EFSA Knowledge Junction community, this report refers to version 3 (https://doi.org/10.5281/zenodo.1339343).

2.5.2. Data reporting

Data reporting was designed to distinguish the Xylella spp. host plant species, based on the number and type of detection methods applied for each finding. Different combinations of detection methods were considered:

  1. Plant species positive with at least two detection methods (among: symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture) or positive with one method (between: sequencing, culture).

  2. The same as point A, but also including microscopy: plant species positive with at least two detection methods (among: microscopy, symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture) or positive with one method (between: sequencing, culture).

  3. Plant species positive with at least one detection method (among: symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture).

  4. Plant species positive with at least one detection method including microscopy (microscopy, symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture).

  5. All positives plant species reported, regardless of the detection methods (positive records but without the detection method specified, symptom observations, microscopy, symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing, culturing).

3. Results

3.1. Results of the literature review

3.1.1. Collected literature and screening for relevance

The extensive literature search was conducted on 30 June 2019 on Web of Science and Scopus platforms and 429 references were collected. Duplicates were removed and 262 references were uploaded in DistillerSR and screened for relevance. Results of the screening process are shown in Figure 1.

Figure 1.

Figure 1

Flow diagram of the screening process

In the first step, i.e. title and abstract screening, 109 references were excluded either because they do not focus on Xylella or Xylella‐associated diseases and/or they are not primary research studies. The selected 153 references were subjected to the second step of the screening process, i.e. the full text screening. Sixty‐seven references, in which Xylella spp. is studied is association to a host plant (i.e. in vivo), were selected and informative data listed in Table 5 were extracted.

Nine additional references retrieved through personal communication of experts, EFSA Horizon Scanning for Plant Health7 and Europhyt outbreak notifications and containing informative data were included in the data extraction.

3.1.2. Unconfirmed studies

Compared to the previous version of the database, two additional publications and one single record were considered unconfirmed/dubious. Those unconfirmed studies are included in the data extraction but excluded from the data analysis.

The paper of Li et al. (2002) reporting experimental infection of Vitis vinifera plants was considered unconfirmed/dubious because, as stated by the EFSA PLH Panel (2015), an aggressive inoculation procedure was used, making difficult to discriminate between stress induced by the treatment and the disease caused by the pathogen itself.

One record regarding a positive PCR result in one Quercus pubescens plant artificially inoculated by X. fastidiosa subsp. pauca strain CoDiRO was considered unconfirmed/dubious as the publication reports that further confirmation tests still need to be performed (Technical report of POnTE and XF‐Actors, 2017), but no updated results have been published so far.

The paper by Naqvi et al. (2017) reporting the presence of Citrus plants affected by Citrus variegated chlorosis in Pakistan was considered unconfirmed/dubious as the presence of X. fastidiosa and its related citrus disease has never been confirmed in this country.

3.2. Update of records already included in the database published in 2018

The records already included in the database published in 2018 (EFSA, 2018) and for which no X. fastidiosa subspecies was assigned to the strain reported in the publication were cross‐checked with the references cited in the publication and/or the author of the article was contacted in order to identify the X. fastidiosa subspecies. Whenever the subspecies was identified, it was inserted in the related record and a comment on the source of information was inserted in the genotyping comment's column. A X. fastidiosa subspecies was assigned to 734 records, of which 356 and 306 records were assigned to the subspecies fastidiosa and pauca, respectively. One record was identified as belonging to the species X. taiwanensis instead of X. fastidiosa subsp. unknown. In 58 records, it was also possible to assign the Sequence type (ST) to the strain, thanks to personal communications of the authors of the publications.

Following the new rationale for reporting geographic coordinates (see Section 2.4), coordinates were included only when specified in the related publications. Such coordinates may refer to single plants, fields or administrative divisions at different level (town, province, regions etc.) and with different level of precision. For more information on the reported geographical coordinates, the related publication was the only source of information that was consulted for this database.

3.3. Host plant species of Xylella spp.

The updated total numbers of plant species, genera and families host of Xylella spp., according to the classification system described in Section 2.5.2, are reported in Table 6. The numbers vary from 343 host plant species, 163 genera and 64 families according to category A (i.e. plant species positive with at least two detection methods (among: symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture) or positive with one method (between: sequencing, culture)) to 595 plant species, 275 genera and 85 families of category E (i.e. all positives plant species reported, regardless of the detection methods). Due to the update of some data already present in the first version of the database (EFSA, 2018), some host plants already present in the database were reclassified in a different category.

Table 6.

Number of host plant species, genera and families of Xylella spp. according to categories A, B, C, D, E (based on the detection methods applied – see Section 2.5.2)

A B C D E
Number of host plant species 343 348 578 587 595
Number of host genera 163 164 274 274 275
Number of host families 64 64 85 85 85

Compared to the database published in 2018 (EFSA, 2018), 37 new host plant species have been identified for X. fastidiosa. Three plant species have been removed from the list of host plants: data on Citrus volkameriana (reported infected by X. fastidiosa in unspecified conditions) were erroneously interpreted, data on Prunus × amygdalo‐persica artificially infected by X. fastidiosa subsp. pauca strain CoDiRO were updated, while the plant species Quercus pubescens has been now considered as unconfirmed (see Section 3.1.2). Details on those 37 new host plants are reported in Table 7. No new host plant species have been identified for the species X. taiwanensis.

Table 7.

New host plants of X. fastidiosa. For each host plant, the infection method (natural, artificial or unspecified), the country (only for natural infections), the X. fastidiosa subspecies (pauca, multiplex or unknown (i.e. not reported in the publication)) and the category (A or C – see Section 2.5.2) are reported

Plant species Infection method Country X. fastidiosa subspecies Category
Amaranthus retroflexus Natural Italy pauca A
Amaranthus retroflexus Natural Italy unknown A
Artemisia sp. Natural Portugal multiplex A
Calicotome sp. Natural France unknown C
Campsis radicans Natural United States unknown C
Chamaesyce canescens Natural Italy pauca A
Cistus albidus Natural Spain unknown A
Cistus × incanus Natural Italy multiplex C
Convolvulus cneorum Natural France multiplex A
Cytisus spinosa Natural France multiplex A
Diospyros kaki Natural United States unknown A
Elaeagnus angustifolia Natural Italy multiplex A
Erigeron karvinskianus Natural France multiplex A
Erigeron sp. Natural Italy pauca A
Euryops pectinatus Natural France multiplex A
Hebe elliptica Natural France multiplex A
Helichrysum sp. Natural Italy multiplex A
Helichrysum stoechas Natural France multiplex A
Helichrysum stoechas Natural Spain unknown A
Hibiscus fragilis Not specified pauca A
Hibiscus sp. Not specified pauca A
Ilex aquifolium Natural Portugal multiplex A
Lavandula latifolia Natural Spain unknown A
Ligustrum sinense Natural United States unknown C
Medicago arborea Natural France multiplex A
Osteospermum ecklonis Natural France multiplex A
Osteospermum fruticosum Natural Italy pauca A
Phlomis fruticosa Natural France multiplex A
Pistacia vera Artificial multiplex A
Pistacia vera Natural Iran multiplex A
Prunus serotina Natural United States unknown C
Robinia pseudoacacia Natural United States multiplex A
Santolina chamaecyparissus Natural France multiplex A
Strelitzia reginae Natural France multiplex A
Teucrium capitatum Natural Spain unknown A
Ulex europaeus Natural Portugal multiplex A
Ulex minor Natural Portugal multiplex A
Vaccinium ashei Natural United States multiplex A
Vaccinium ashei Natural United States unknown A
Vaccinium darrowii Not specified unknown C
Vaccinium elliottii Natural United States unknown C

Thirty new plant species have been identified as host plants of X. fastidiosa according to category A, and seven according to category C (as described in Section 2.5.2). Most of the new host plant species were naturally infected and identified both in the EU (France, Italy, Portugal and Spain) and outside the EU (Iran and the United States of America). Pistacia vera was also tested in experimental conditions and three plant taxa (Hibiscus fragilis, Hibiscus sp., Vaccinium darrowii) were reported infected in not specified conditions. The X. fastidiosa subspecies identified in the new host plants were multiplex, pauca or not reported (unknown).

The overall number of host plant species infected naturally, artificially and in unspecified conditions by the different X. fastidiosa subspecies and according to the different categories are reported in Tables 8, 9 and 10, whereas the pathogen species Xylella taiwanensis was recorded only in the plant species Pyrus pyrifolia.

Table 8.

Number of host plant species, naturally infected, susceptible to the different X. fastidiosa subspecies according to categories A, B, C, D, E

Category fastidiosa fastidiosa/sandyi morus multiplex pauca sandyi tashke unknown
A 39 2 4 141 45 6 1 152
B 39 2 4 141 45 6 1 157
C 43 2 4 146 47 7 1 354
D 43 2 4 146 47 7 1 360
E 44 2 4 147 47 7 1 371

Table 9.

Number of host plant species, artificially infected, susceptible to the different X. fastidiosa subspecies according to categories A, B, C, D, E

Category fastidiosa morus multiplex pauca sandyi tashke unknown
A 37 2 18 15 5 0 89
B 38 2 18 16 5 0 94
C 50 2 22 24 6 1 201
D 50 2 22 24 6 1 207
E 53 2 23 24 6 1 215

Table 10.

Number of host plant species, infected in unspecified conditions, susceptible to the different X. fastidiosa subspecies according to categories A, B, C, D, E

Category fastidiosa multiplex pauca sandyi unknown
A 7 13 8 1 16
B 7 13 8 1 18
C 7 16 8 2 27
D 7 16 8 2 29
E 7 16 8 2 31

Considering the plant species naturally infected, the highest number of host plants is recorded for the subspecies multiplex (141 plant species for cat. A) and for unknown X. fastidiosa subspecies (152 plant species for cat. A, increasing to 371 for cat. E). The highest number of plant species artificially infected by X. fastidiosa is recorded for unknown subspecies (89 plant species for cat. A, rising to 2015 for cat. E) and for the subspecies fastidiosa (37 for cat. A).

The plant species behind the numbers shown in Tables 8, 9 and 10 are listed in Appendices A, B and C. In those appendices, the full lists of plant species infected by the different X. fastidiosa subspecies naturally, artificially and in not specified conditions according to the five categories are shown.

The ‘top 10’ host plant families, i.e. the families owning the highest numbers of host plant species, are shown in Figure 2. Fabaceae appears to be the plant family owning the highest number of host plants (61), followed by Asteraceae (57) and Vitaceae (48).

Figure 2.

Figure 2

This figure shows the top 10 host plant families for Xylella spp. and the number of host plant species within each family

Infection by Xylella spp. can be detected using different detection techniques, sometimes providing non‐convergent results (i.e. the sample is positive to one or more detection methods but negative for others). Records reporting non‐convergent results are reported in the database but have not been included in the data analysis.

3.4. X. fastidiosa Sequence Types and host plants association

The full list of plant species infected by the different X. fastidiosa Sequence Types (ST) in natural, artificial and not specified conditions is reported in Appendix D. For each plant species, the number of records reporting infection by that specific ST is counted. For natural infection, it is also reported the country where the plant species have been identified, whereas for artificial and not specified infection only, the total number of records is present in the Appendix.

Totally, 1,202 records reporting information on 194 plant species infected by 87 different STs have been reported in the database. Most of the records (884) refer to natural infections that were reported in North, Central and South America (United States of America, Mexico, Honduras, Costa Rica, Ecuador, Brazil and Argentina) and Europe (Portugal, Spain, France and Italy). The highest number of records for artificial infections belong to STs of subsp. pauca (127 records), whereas ST1 (subsp. fastidiosa) is the most studied ST with 95 records.

Compared to the previous version of the database (EFSA, 2018), six new STs have been identified worldwide. In the United States of America, Vaccinium ashei has been reported as infected by STs 82 and 83 (subsp. multiplex), and in Brazil STs 84, 85 and 86 (subsp. pauca) have been identified in Olea europaea plants. In Italy, ST 87 belonging to subsp. multiplex has been detected in several plant species in Monte Argentario (Tuscany).

3.5. Tolerant and resistant response of plant species

Information on tolerant and resistant response of plant species to X. fastidiosa infection have been also reported in the database. The list of plant genera and species for which tolerant and resistant response have been identified is reported in Table 11. Information on tolerant/resistant status have been reported in 64 plant species with a total number of 491 records, but the most studied genera are Vitis, Citrus and Prunus (224, 175 and 54 records, respectively), reflecting the important economic value of their plant species.

Table 11.

Number of records reporting tolerant/resistant response for plant genus and species

Plant genus and species Number of records
Arabidopsis 4
Arabidopsis thaliana 4
Citrus 175
Citrus celebica 1
Citrus clementina 4
Citrus jambhiri 2
Citrus junos 1
Citrus latifolia 1
Citrus limettioides 1
Citrus limon 14
Citrus medica 1
Citrus natsudaidai 1
Citrus paradisi 5
Citrus reticulata 9
Citrus reticulata × C. sinensis × C. paradisi 1
Citrus sinensis 8
Citrus sp. 70
Citrus tangerina 32
Citrus × nobilis 11
Citrus × tangelo 13
Coffea 5
Coffea arabica 4
Coffea sp. 1
Fortunella 1
Fortunella margarita 1
Medicago 2
Medicago sativa 2
Olea 14
Olea europaea 14
Platanus 2
Platanus sp. 2
Poncirus 3
Poncirus trifoliata 3
Prunus 54
Prunus angustifolia 1
Prunus armeniaca 3
Prunus avium 5
Prunus cerasus 2
Prunus domestica 3
Prunus dulcis 8
Prunus persica 7
Prunus salicina 10
Prunus sp. 13
Prunus × amygdalo‐persica 2
Quercus 2
Quercus ilex 2
Vaccinium 5
Vaccinium corymbosum 5
Vitis 224
Vitis aestivalis 2
Vitis arizonica 5
Vitis arizonica hybrid 6
Vitis arizonica × V. rupestris 6
Vitis arizonica × V. vinifera 1
Vitis arizonica/candicans 3
Vitis arizonica/candicans × V. rupestris 2
Vitis arizonica/girdiana 1
Vitis berlandieri × riparia hybrids 6
Vitis berlandieri × V. rupestris 4
Vitis candicans 2
Vitis cinerea × V. berlandieri 2
Vitis girdiana 2
Vitis munsoniana 3
Vitis popenoei 1
Vitis rotundifolia 58
Vitis rotundifolia × V. rupestris 1
Vitis simpsonii 1
Vitis sp. 76
Vitis tiliaefolia 1
Vitis vinifera 25
Vitis aestivalis var. smalliana 4
Vitis aestivalis var. smalliana × V. simpsonii 4
Vitis aestivalis var. smalliana × V. vinifera 1
Vitis nesbittiana 1
Vitis rufotomentosa 1
Vitis shuttleworthii 5
TOTAL 491

Eleven categories have been created to group different tolerant/resistant response to X. fastidiosa infection. Those categories include the plant response/s for which the authors of the publication considered that plant as tolerant/resistant to X. fastidiosa infection. One hundred and eight publications, recorded in 491 record (245 for artificial infections), report information on tolerance and resistance outcome to X. fastidiosa infection (Table 12). In 41 publications, the authors consider the plant tolerant or resistant, but without adding further details, whereas in 19 publications, the lower bacterial populations harboured by the plant was considered the demonstration of the tolerant/resistant status of the plant. With more than 70 records, the lack of infection and lack or reduction of symptoms (in both natural and artificial infections) are the two most reported tolerant/resistant outcome.

Table 12.

Number of records and publications for tolerance/resistance category

Tolerance/resistance category Number of records Number of publications
Natural infection Artificial infection Infection not specified
Lack of infection or Negative reading 78 42 14
Lack of systemic movement 50 7
Lack or reduction of symptoms 75 74 10
Lack or reduction of symptoms – Lower bacterial population 3 12 7
Lack or reduction of symptoms – Lower bacterial population – Lower disease incidence 2 2
Lack or reduction of symptoms – Lower disease incidence 2 1
Lower bacterial population 6 46 19
Lower bacterial population – Lower disease incidence 2 2
Lower disease incidence 4 2
Not persistent infection 3 5 3
Reported as tolerant/resistant_no details 22 16 49 41
TOTAL 197 245 49 108

4. Conclusions

Following a request of the European Commission, EFSA was asked in 2016 to create, maintain and regularly update a database of host plant species of Xylella spp. In 2018, EFSA released a new and renovated Xylella spp. host plant database (EFSA, 2018), that was now updated.

An extensive literature search was performed including all scientific papers published up to 30 June 2019, as well as additional documents obtained from research groups, personal communications of experts, EFSA Horizon Scanning activities for Plant Health and Europhyt outbreak notifications (last accessed on 15 October 2019). By these searches, 271 recent publications were collected and screened to select the publications in which Xylella spp. was studied in association with a plant species. As a result, 76 publications were selected and informative data on botanical identification of the plant species, infection method, geographical information, Xylella spp. genetics, detection techniques and tolerant/resistant response of the plant were extracted.

Some data already included in the database published in 2018 were updated: in particular, the X. fastidiosa subspecies was identified for several strains, thanks to references review and author's personal communications; in this update, only geographical coordinates explicitly reported in the publications were reported.

Thirty‐seven new host plant species of X. fastidiosa were added to the database. Most of those plant species were naturally infected and identified in France, Iran, Italy, Portugal, Spain and the United States of America. X. fastidiosa subspecies infecting the new host plants were multiplex, pauca or not identified (unknown/not reported in the study). No new data were retrieved for X. taiwanensis that up to now has been reported only in Pyrus pyrifolia plants.

The overall number of Xylella spp. host plants reached 343 plant species, 163 genera and 64 families for category A (i.e. plant species positive with at least two detection methods (among: symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture) or positive with one method (between: sequencing, culture), till 595 plant species, 275 genera and 85 families for category E (i.e. all positives plant species reported, regardless of the detection methods).

Since the release of the first version of this database (EFSA, 2018), six new Multilocus Sequence Types (STs) have been identified worldwide: STs 82 and 83 (subsp. multiplex) in the United States of America, STs 84, 85 and 96 (subsp. pauca) in Brazil and ST 87 (subsp. multiplex) in Italy.

Information on tolerant/resistant status were reported for 64 plant species in 108 publications, with a total number of 491 records. The economically important Vitis, Citrus and Prunus genera are the most studied and reported plant taxa.

The EFSA database on Xylella spp. host plants will be updated regularly and it aims to provide useful information and scientific support to risk assessors, risk managers and researchers dealing with Xylella spp.

Data are available as interactive reports on the Microstrategy platform at the following link: https://www.efsa.europa.eu/en/microstrategy/xylella

Raw data and related metadata are published in Zenodo in the EFSA Knowledge Junction community, this report refers to version 3 (https://doi.org/10.5281/zenodo.1339343).

Abbreviations

DCF

Data Collection Framework

EFSA PLH Panel

EFSA Panel on Plant Health

ELISA

enzyme‐linked immunosorbent assay

EPPO

European and Mediterranean Plant Protection Organization

ETL

Extract Transform Load

PCR

polymerase chain reaction

S‐DWH

EFSA Scientific Data Warehouse

ST

sequence type

Appendix A – Host plant species naturally infected

1.

List of host plant species, naturally infected, of X. fastidiosa subsp. unknown (i.e. not reported in the publication), subsp. fastidiosa, subsp. fastidiosa/sandyi, subsp. morus, subsp. multiplex, subsp. pauca, subsp. sandyi, subsp. tashke and X. taiwanensis according to categories A, B, C, D, E (as reported in Section 2.5.2):

A. Plant species positive with at least two detection methods (among: symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture) or positive with one method (between: sequencing, culture).

B. The same as point A, but also including microscopy: plant species positive with at least two detection methods (among: microscopy, symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture) or positive with one method (between: sequencing, culture).

C. Plant species positive with at least one detection method (among: symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture).

D. Plant species positive with at least one detection method including microscopy (microscopy, symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture).

E. All positives plant species reported, regardless of the detection methods (positive records but without the detection method specified, symptom observations, microscopy, symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing, culturing).

Plant species Pest Category
Acacia saligna Xf subsp. unknown A
Acer rubrum Xf subsp. unknown A
Albizia julibrissin Xf subsp. unknown A
Amaranthus retroflexus Xf subsp. unknown A
Ambrosia psilostachya Xf subsp. unknown A
Ambrosia trifida Xf subsp. unknown A
Ampelopsis arborea Xf subsp. unknown A
Ampelopsis brevipedunculata Xf subsp. unknown A
Ampelopsis brevipedunculata var. hancei Xf subsp. unknown A
Asparagus acutifolius Xf subsp. unknown A
Baccharis halimifolia Xf subsp. unknown A
Baccharis sp. Xf subsp. unknown A
Brassica sp. Xf subsp. unknown A
Callicarpa americana Xf subsp. unknown A
Carya illinoinensis Xf subsp. unknown A
Catharanthus roseus Xf subsp. unknown A
Cercis occidentalis Xf subsp. unknown A
Chamaecrista fasciculata Xf subsp. unknown A
Chionanthus retusus Xf subsp. unknown A
Chitalpa tashkentensis Xf subsp. unknown A
Cistus albidus Xf subsp. unknown A
Cistus creticus Xf subsp. unknown A
Citrus aurantium Xf subsp. unknown A
Citrus celebica Xf subsp. unknown A
Citrus jambhiri Xf subsp. unknown A
Citrus limon Xf subsp. unknown A
Citrus medica Xf subsp. unknown A
Citrus natsudaidai Xf subsp. unknown A
Citrus paradisi Xf subsp. unknown A
Citrus reticulata Xf subsp. unknown A
Citrus sinensis Xf subsp. unknown A
Citrus sp. Xf subsp. unknown A
Citrus tangerina Xf subsp. unknown A
Citrus × nobilis Xf subsp. unknown A
Citrus × tangelo Xf subsp. unknown A
Coelorachis cylindrica Xf subsp. unknown A
Coffea arabica Xf subsp. unknown A
Coffea sp. Xf subsp. unknown A
Conium maculatum Xf subsp. unknown A
Digitaria sp. Xf subsp. unknown A
Diospyros kaki Xf subsp. unknown A
Diplocyclos palmatus Xf subsp. unknown A
Dodonaea viscosa Xf subsp. unknown A
Euphorbia terracina Xf subsp. unknown A
Fagus crenata Xf subsp. unknown A
Fatsia japonica Xf subsp. unknown A
Ficus carica Xf subsp. unknown A
Fraxinus pennsylvanica Xf subsp. unknown A
Genista × spachiana Xf subsp. unknown A
Ginkgo biloba Xf subsp. unknown A
Grevillea juniperina Xf subsp. unknown A
Helianthus annuus Xf subsp. unknown A
Helichrysum stoechas Xf subsp. unknown A
Hemerocallis sp. Xf subsp. unknown A
Hibiscus schizopetalus Xf subsp. unknown A
Humulus scandens Xf subsp. unknown A
Ilex vomitoria Xf subsp. unknown A
Iva annua Xf subsp. unknown A
Jacaranda mimosifolia Xf subsp. unknown A
Juglans sp. Xf subsp. unknown A
Juniperus ashei Xf subsp. unknown A
Lagerstroemia indica Xf subsp. unknown A
Lagerstroemia sp. Xf subsp. unknown A
Laurus nobilis Xf subsp. unknown A
Lavandula angustifolia Xf subsp. unknown A
Lavandula dentata Xf subsp. unknown A
Lavandula latifolia Xf subsp. unknown A
Ligustrum lucidum Xf subsp. unknown A
Liquidambar styraciflua Xf subsp. unknown A
Lonicera japonica Xf subsp. unknown A
Lupinus aridorum Xf subsp. unknown A
Lupinus villosus Xf subsp. unknown A
Magnolia grandiflora Xf subsp. unknown A
Mallotus paniculatus Xf subsp. unknown A
Medicago sativa Xf subsp. unknown A
Mimosa sp. Xf subsp. unknown A
Modiola caroliniana Xf subsp. unknown A
Morus alba Xf subsp. unknown A
Morus rubra Xf subsp. unknown A
Morus sp. Xf subsp. unknown A
Myoporum insulare Xf subsp. unknown A
Myrtus communis Xf subsp. unknown A
Nandina domestica Xf subsp. unknown A
Neptunia lutea Xf subsp. unknown A
Nerium oleander Xf subsp. unknown A
Olea europaea Xf subsp. unknown A
Olea europaea subsp. sylvestris Xf subsp. unknown A
Olea sp. Xf subsp. unknown A
Parthenocissus quinquefolia Xf subsp. unknown A
Paspalum dilatatum Xf subsp. unknown A
Periwinkle (common name) Xf subsp. unknown A
Persea americana Xf subsp. unknown A
Phoenix reclinata Xf subsp. unknown A
Phoenix roebelenii Xf subsp. unknown A
Pinus taeda Xf subsp. unknown A
Platanus occidentalis Xf subsp. unknown A
Platanus sp. Xf subsp. unknown A
Polygala myrtifolia Xf subsp. unknown A
Prunus avium Xf subsp. unknown A
Prunus cerasifera Xf subsp. unknown A
Prunus cerasifera × P. munsoniana Xf subsp. unknown A
Prunus dulcis Xf subsp. unknown A
Prunus persica Xf subsp. unknown A
Prunus salicina Xf subsp. unknown A
Prunus sp. Xf subsp. unknown A
Pyrus pyrifolia Xf subsp. unknown A
Pyrus sp. Xf subsp. unknown A
Quercus coccinea Xf subsp. unknown A
Quercus falcata Xf subsp. unknown A
Quercus laevis Xf subsp. unknown A
Quercus laurifolia Xf subsp. unknown A
Quercus nigra Xf subsp. unknown A
Quercus palustris Xf subsp. unknown A
Quercus rubra Xf subsp. unknown A
Quercus sp. Xf subsp. unknown A
Quercus velutina Xf subsp. unknown A
Quercus virginiana Xf subsp. unknown A
Ratibida columnifera Xf subsp. unknown A
Rhamnus alaternus Xf subsp. unknown A
Rhus sp. Xf subsp. unknown A
Rosmarinus officinalis Xf subsp. unknown A
Rubus hedycarpus subsp. procerus Xf subsp. unknown A
Rubus sp. Xf subsp. unknown A
Sambucus canadensis Xf subsp. unknown A
Sassafras albidum Xf subsp. unknown A
Sassafras sp. Xf subsp. unknown A
Setaria magna Xf subsp. unknown A
Solidago fistulosa Xf subsp. unknown A
Spartium junceum Xf subsp. unknown A
Stewartia pseudocamellia Xf subsp. unknown A
Symphyotrichum divaricatum Xf subsp. unknown A
Teucrium capitatum Xf subsp. unknown A
Trifolium repens Xf subsp. unknown A
Ulmus americana Xf subsp. unknown A
Ulmus glabra Xf subsp. unknown A
Ulmus pumila Xf subsp. unknown A
Ulmus sp. Xf subsp. unknown A
Vaccinium ashei Xf subsp. unknown A
Vaccinium corymbosum Xf subsp. unknown A
Vaccinium sp. Xf subsp. unknown A
Vaccinium virgatum Xf subsp. unknown A
Vinca minor Xf subsp. unknown A
Vitis californica Xf subsp. unknown A
Vitis candicans Xf subsp. unknown A
Vitis labrusca Xf subsp. unknown A
Vitis labrusca × V. vinifera Xf subsp. unknown A
Vitis munsoniana Xf subsp. unknown A
Vitis muscadina Xf subsp. unknown A
Vitis rotundifolia Xf subsp. unknown A
Vitis sp. Xf subsp. unknown A
Vitis vinifera Xf subsp. unknown A
Vitis vulpina Xf subsp. unknown A
Acer saccharum Xf subsp. unknown B
Cyperus eragrostis Xf subsp. unknown B
Hevea brasiliensis Xf subsp. unknown B
Prunus domestica Xf subsp. unknown B
Sorghum halepense Xf subsp. unknown B
Acacia longifolia Xf subsp. unknown C
Acer macrophyllum Xf subsp. unknown C
Acer negundo Xf subsp. unknown C
Acer platanoides Xf subsp. unknown C
Acer sp. Xf subsp. unknown C
Aesculus × hybrida Xf subsp. unknown C
Agathis australis Xf subsp. unknown C
Agrostis gigantea Xf subsp. unknown C
Alectryon excelsus Xf subsp. unknown C
Alternanthera ficoidea Xf subsp. unknown C
Amaranthus sp. Xf subsp. unknown C
Anisantha diandra Xf subsp. unknown C
Anisantha rigida Xf subsp. unknown C
Arctostaphylos sp. Xf subsp. unknown C
Artemisia douglasiana Xf subsp. unknown C
Atriplex sp. Xf subsp. unknown C
Avena fatua Xf subsp. unknown C
Axonopus compressus Xf subsp. unknown C
Baccharis pilularis Xf subsp. unknown C
Bidens pilosa Xf subsp. unknown C
Boerhavia diffusa Xf subsp. unknown C
Borreria latifolia Xf subsp. unknown C
Brachiaria decumbens Xf subsp. unknown C
Brachiaria plantaginea Xf subsp. unknown C
Brachyglottis sp. Xf subsp. unknown C
Bromus sp. Xf subsp. unknown C
Broussonetia papyrifera Xf subsp. unknown C
Calicotome sp. Xf subsp. unknown C
Calicotome spinosa Xf subsp. unknown C
Calyptocarpus biaristatus Xf subsp. unknown C
Campsis radicans Xf subsp. unknown C
Capsella bursa‐pastoris Xf subsp. unknown C
Carex sp. Xf subsp. unknown C
Celastrus orbiculatus Xf subsp. unknown C
Cenchrus echinatus Xf subsp. unknown C
Chamaesyce hirta Xf subsp. unknown C
Chenopodiastrum murale Xf subsp. unknown C
Chloris halophila Xf subsp. unknown C
Cistus monspeliensis Xf subsp. unknown C
Coffea arabica × C. canephora Xf subsp. unknown C
Coffea arabica × C. eugenioides Xf subsp. unknown C
Coffea arabica × C. liberica var. dewevrei Xf subsp. unknown C
Coffea arabica × C. racemosa Xf subsp. unknown C
Coffea canephora Xf subsp. unknown C
Coffea racemosa Xf subsp. unknown C
Coffea eugenioides Xf subsp. unknown C
Coffea kapakata Xf subsp. unknown C
Coffea liberica var. dewevrei Xf subsp. unknown C
Coffea stenophylla Xf subsp. unknown C
Commelina benghalensis Xf subsp. unknown C
Commelina erecta Xf subsp. unknown C
Convolvulus arvensis Xf subsp. unknown C
Coprosma repens Xf subsp. unknown C
Coprosma robusta Xf subsp. unknown C
Cordyline australis Xf subsp. unknown C
Cordyline sp. Xf subsp. unknown C
Cornus florida Xf subsp. unknown C
Corokia cotoneaster Xf subsp. unknown C
Corokia macrocarpa Xf subsp. unknown C
Corokia sp. Xf subsp. unknown C
Corynocarpus laevigatus Xf subsp. unknown C
Croton setigerus Xf subsp. unknown C
Cynodon dactylon Xf subsp. unknown C
Cyperus sp. Xf subsp. unknown C
Cytisus scoparius Xf subsp. unknown C
Datura wrightii Xf subsp. unknown C
Digitaria horizontalis Xf subsp. unknown C
Digitaria insularis Xf subsp. unknown C
Digitaria sanguinalis Xf subsp. unknown C
Duranta erecta Xf subsp. unknown C
Dysphania ambrosioides Xf subsp. unknown C
Echinochloa crus‐galli Xf subsp. unknown C
Eleusine indica Xf subsp. unknown C
Erigeron canadensis Xf subsp. unknown C
Eriochloa contracta Xf subsp. unknown C
Eriogonum sp. Xf subsp. unknown C
Erodium botrys Xf subsp. unknown C
Erodium moschatum Xf subsp. unknown C
Erodium sp. Xf subsp. unknown C
Escallonia bifida Xf subsp. unknown C
Eucalyptus sp. Xf subsp. unknown C
Facelis retusa Xf subsp. unknown C
Fragaria vesca subsp. californica Xf subsp. unknown C
Fraxinus angustifolia Xf subsp. unknown C
Fraxinus dipetala Xf subsp. unknown C
Fuchsia magellanica Xf subsp. unknown C
Genista lucida Xf subsp. unknown C
Geranium dissectum Xf subsp. unknown C
Haloragis erecta Xf subsp. unknown C
Hebe sp. Xf subsp. unknown C
Hedera helix Xf subsp. unknown C
Heliotropium fruticosum Xf subsp. unknown C
Heliotropium indicum Xf subsp. unknown C
Heterotheca grandiflora Xf subsp. unknown C
Hordeum murinum Xf subsp. unknown C
Hydrangea paniculata Xf subsp. unknown C
Hypochaeris brasiliensis Xf subsp. unknown C
Ipomoea fistulosa Xf subsp. unknown C
Juglans regia Xf subsp. unknown C
Lactuca serriola Xf subsp. unknown C
Leonurus sibiricus Xf subsp. unknown C
Lepidium auriculatum Xf subsp. unknown C
Lepidium didymum Xf subsp. unknown C
Ligustrum sinense Xf subsp. unknown C
Ligustrum virginicum Xf subsp. unknown C
Liriodendron tulipifera Xf subsp. unknown C
Lolium multiflorum Xf subsp. unknown C
Lolium perenne Xf subsp. unknown C
Ludwigia grandiflora Xf subsp. unknown C
Malva parviflora Xf subsp. unknown C
Marrubium vulgare Xf subsp. unknown C
Medicago polymorpha Xf subsp. unknown C
Melicope ternata Xf subsp. unknown C
Melicytus ramiflorus Xf subsp. unknown C
Melilotus sp. Xf subsp. unknown C
Melissa officinalis Xf subsp. unknown C
Merremia macrocalyx Xf subsp. unknown C
Meryta sinclairii Xf subsp. unknown C
Metrosideros excelsa Xf subsp. unknown C
Metrosideros sp. Xf subsp. unknown C
Metrosideros kermadecensis Xf subsp. unknown C
Montiastrum lineare Xf subsp. unknown C
Myoporum laetum Xf subsp. unknown C
Origanum majorana Xf subsp. unknown C
Panicum acuminatum Xf subsp. unknown C
Parthenocissus tricuspidata Xf subsp. unknown C
Paspalum urvillei Xf subsp. unknown C
Paspalum regnellii Xf subsp. unknown C
Passiflora foetida Xf subsp. unknown C
Pennisetum clandestinum Xf subsp. unknown C
Persicaria lapathifolia Xf subsp. unknown C
Persicaria maculosa Xf subsp. unknown C
Phalaris angusta Xf subsp. unknown C
Phoenix sp. Xf subsp. unknown C
Phormium colensoi Xf subsp. unknown C
Phormium tenax Xf subsp. unknown C
Pittosporum crassifolium Xf subsp. unknown C
Pittosporum eugenioides Xf subsp. unknown C
Pittosporum tenuifolium Xf subsp. unknown C
Pittosporum umbellatum Xf subsp. unknown C
Plantago lanceolata Xf subsp. unknown C
Pluchea odorata Xf subsp. unknown C
Poa annua Xf subsp. unknown C
Polygonum arenastrum Xf subsp. unknown C
Portulaca oleracea Xf subsp. unknown C
Prunus angustifolia Xf subsp. unknown C
Prunus laurocerasus Xf subsp. unknown C
Prunus serotina Xf subsp. unknown C
Prunus serrulata Xf subsp. unknown C
Prunus simonii × P. salicina × P. cerasifera × P. munsoniana Xf subsp. unknown C
Quercus agrifolia Xf subsp. unknown C
Quercus alba Xf subsp. unknown C
Quercus ilex Xf subsp. unknown C
Quercus imbricaria Xf subsp. unknown C
Quercus incana Xf subsp. unknown C
Quercus macrocarpa Xf subsp. unknown C
Quercus phellos Xf subsp. unknown C
Ranunculus repens Xf subsp. unknown C
Rhus diversiloba Xf subsp. unknown C
Richardia sp. Xf subsp. unknown C
Rosa californica Xf subsp. unknown C
Rubus ursinus Xf subsp. unknown C
Rubus vitifolius Xf subsp. unknown C
Rumex crispus Xf subsp. unknown C
Salix sp. Xf subsp. unknown C
Salsola kali subsp. tragus Xf subsp. unknown C
Sambucus cerulea Xf subsp. unknown C
Senecio grisebachii Xf subsp. unknown C
Senecio vulgaris Xf subsp. unknown C
Senna secundiflora Xf subsp. unknown C
Sida rhombifolia Xf subsp. unknown C
Silybum marianum Xf subsp. unknown C
Sisymbrium irio Xf subsp. unknown C
Solanum americanum Xf subsp. unknown C
Sonchus oleraceus Xf subsp. unknown C
Sonchus sp. Xf subsp. unknown C
Sophora secundiflora Xf subsp. unknown C
Stachys arvensis Xf subsp. unknown C
Stellaria media Xf subsp. unknown C
Syzygium paniculatum Xf subsp. unknown C
Talinum paniculatum Xf subsp. unknown C
Taraxacum officinale Xf subsp. unknown C
Trifolium incarnatum Xf subsp. unknown C
Urtica dioica subsp. gracilis Xf subsp. unknown C
Urtica urens Xf subsp. unknown C
Vaccinium elliottii Xf subsp. unknown C
Verbena litoralis Xf subsp. unknown C
Vernonia sp. Xf subsp. unknown C
Veronica persica Xf subsp. unknown C
Veronica sp. Xf subsp. unknown C
Vicia ludoviciana Xf subsp. unknown C
Vinca major Xf subsp. unknown C
Vitex lucens Xf subsp. unknown C
Vitis arizonica Xf subsp. unknown C
Vitis girdiana Xf subsp. unknown C
Wisteria frutescens Xf subsp. unknown C
Xanthium spinosum Xf subsp. unknown C
Citrus × limonia Xf subsp. unknown D
Coffea liberica Xf subsp. unknown D
Prunus americana Xf subsp. unknown D
Prunus munsoniana Xf subsp. unknown D
Prunus simonii Xf subsp. unknown D
Solidago canadensis Xf subsp. unknown D
Prunus armeniaca Xf subsp. unknown E
Prunus hortulana Xf subsp. unknown E
Prunus mexicana Xf subsp. unknown E
Ulmus × hollandica Xf subsp. unknown E
Vitis aestivalis Xf subsp. unknown E
Vitis bourquiniana Xf subsp. unknown E
Vitis cinerea Xf subsp. unknown E
Vitis simpsonii Xf subsp. unknown E
Vitis × champinii Xf subsp. unknown E
Vitis rufotomentosa Xf subsp. unknown E
Vitis shuttleworthii Xf subsp. unknown E
Plant species Pest Category
Acer sp. Xf subsp. fastidiosa A
Calicotome spinosa Xf subsp. fastidiosa A
Cercis occidentalis Xf subsp. fastidiosa A
Cistus monspeliensis Xf subsp. fastidiosa A
Citrus sinensis Xf subsp. fastidiosa A
Coffea arabica Xf subsp. fastidiosa A
Erysimum hybrids Xf subsp. fastidiosa A
Genista lucida Xf subsp. fastidiosa A
Juglans regia Xf subsp. fastidiosa A
Lupinus aridorum Xf subsp. fastidiosa A
Magnolia grandiflora Xf subsp. fastidiosa A
Medicago sativa Xf subsp. fastidiosa A
Metrosideros sp. Xf subsp. fastidiosa A
Morus sp. Xf subsp. fastidiosa A
Nerium oleander Xf subsp. fastidiosa A
Pluchea odorata Xf subsp. fastidiosa A
Polygala myrtifolia Xf subsp. fastidiosa A
Prunus avium Xf subsp. fastidiosa A
Prunus dulcis Xf subsp. fastidiosa A
Prunus persica Xf subsp. fastidiosa A
Prunus sp. Xf subsp. fastidiosa A
Rhamnus alaternus Xf subsp. fastidiosa A
Rosmarinus officinalis Xf subsp. fastidiosa A
Rubus rigidus Xf subsp. fastidiosa A
Rubus ursinus Xf subsp. fastidiosa A
Sambucus canadensis Xf subsp. fastidiosa A
Spartium junceum Xf subsp. fastidiosa A
Streptocarpus hybrids Xf subsp. fastidiosa A
Ulmus americana Xf subsp. fastidiosa A
Vinca major Xf subsp. fastidiosa A
Vitis aestivalis Xf subsp. fastidiosa A
Vitis aestivalis hybrid Xf subsp. fastidiosa A
Vitis californica Xf subsp. fastidiosa A
Vitis candicans Xf subsp. fastidiosa A
Vitis cinerea var. helleri × V. vulpina Xf subsp. fastidiosa A
Vitis girdiana Xf subsp. fastidiosa A
Vitis rotundifolia Xf subsp. fastidiosa A
Vitis sp. Xf subsp. fastidiosa A
Vitis vinifera Xf subsp. fastidiosa A
Ambrosia artemisiifolia Xf subsp. fastidiosa C
Broussonetia papyrifera Xf subsp. fastidiosa C
Quercus sp. Xf subsp. fastidiosa C
Ulmus sp. Xf subsp. fastidiosa C
Sambucus sp. Xf subsp. fastidiosa E
Plant species Pest Category
Coffea arabica Xf subsp.fastidiosa/sandyi A
Coffea canephora Xf subsp.fastidiosa/sandyi A
Plant species Pest Category
Morus alba Xf subsp. morus A
Morus rubra Xf subsp. morus A
Morus sp. Xf subsp. morus A
Nandina domestica Xf subsp. morus A
Plant species Pest Category
Acacia dealbata Xf subsp. multiplex A
Acacia longifolia Xf subsp. multiplex A
Acacia saligna Xf subsp. multiplex A
Acacia sp. Xf subsp. multiplex A
Acer griseum Xf subsp. multiplex A
Acer pseudoplatanus Xf subsp. multiplex A
Acer rubrum Xf subsp. multiplex A
Alnus rhombifolia Xf subsp. multiplex A
Ambrosia psilostachya Xf subsp. multiplex A
Ambrosia trifida Xf subsp. multiplex A
Ambrosia trifida var. texana Xf subsp. multiplex A
Ampelopsis cordata Xf subsp. multiplex A
Anthyllis hermanniae Xf subsp. multiplex A
Artemisia arborescens Xf subsp. multiplex A
Artemisia sp. Xf subsp. multiplex A
Asparagus acutifolius Xf subsp. multiplex A
Baccharis halimifolia Xf subsp. multiplex A
Calicotome spinosa Xf subsp. multiplex A
Calicotome villosa Xf subsp. multiplex A
Carya illinoinensis Xf subsp. multiplex A
Carya sp. Xf subsp. multiplex A
Celtis occidentalis Xf subsp. multiplex A
Cercis canadensis Xf subsp. multiplex A
Cercis occidentalis Xf subsp. multiplex A
Cercis siliquastrum Xf subsp. multiplex A
Chionanthus sp. Xf subsp. multiplex A
Cistus creticus Xf subsp. multiplex A
Cistus monspeliensis Xf subsp. multiplex A
Cistus salviifolius Xf subsp. multiplex A
Cistus sp. Xf subsp. multiplex A
Convolvulus cneorum Xf subsp. multiplex A
Coprosma repens Xf subsp. multiplex A
Coronilla valentina Xf subsp. multiplex A
Coronilla valentina subsp. glauca Xf subsp. multiplex A
Cytisus scoparius Xf subsp. multiplex A
Cytisus sp. Xf subsp. multiplex A
Cytisus spinosa Xf subsp. multiplex A
Cytisus villosus Xf subsp. multiplex A
Dodonaea viscosa Xf subsp. multiplex A
Elaeagnus angustifolia Xf subsp. multiplex A
Encelia farinosa Xf subsp. multiplex A
Erigeron karvinskianus Xf subsp. multiplex A
Euryops chrysanthemoides Xf subsp. multiplex A
Euryops pectinatus Xf subsp. multiplex A
Fallopia japonica Xf subsp. multiplex A
Ficus carica Xf subsp. multiplex A
Fraxinus americana Xf subsp. multiplex A
Fraxinus angustifolia Xf subsp. multiplex A
Fraxinus sp. Xf subsp. multiplex A
Genista corsica Xf subsp. multiplex A
Genista ephedroides Xf subsp. multiplex A
Genista sp. Xf subsp. multiplex A
Genista × spachiana Xf subsp. multiplex A
Ginkgo biloba Xf subsp. multiplex A
Gleditsia triacanthos Xf subsp. multiplex A
Grevillea juniperina Xf subsp. multiplex A
Hebe elliptica Xf subsp. multiplex A
Hebe sp. Xf subsp. multiplex A
Helianthus annuus Xf subsp. multiplex A
Helianthus sp. Xf subsp. multiplex A
Helichrysum italicum Xf subsp. multiplex A
Helichrysum sp. Xf subsp. multiplex A
Helichrysum stoechas Xf subsp. multiplex A
Ilex aquifolium Xf subsp. multiplex A
Iva annua Xf subsp. multiplex A
Koelreuteria bipinnata Xf subsp. multiplex A
Lagerstroemia indica Xf subsp. multiplex A
Lagerstroemia sp. Xf subsp. multiplex A
Laurus nobilis Xf subsp. multiplex A
Lavandula angustifolia Xf subsp. multiplex A
Lavandula dentata Xf subsp. multiplex A
Lavandula sp. Xf subsp. multiplex A
Lavandula stoechas Xf subsp. multiplex A
Lavandula × heterophylla Xf subsp. multiplex A
Lavandula × intermedia Xf subsp. multiplex A
Liquidambar styraciflua Xf subsp. multiplex A
Lonicera japonica Xf subsp. multiplex A
Lupinus villosus Xf subsp. multiplex A
Medicago arborea Xf subsp. multiplex A
Medicago sativa Xf subsp. multiplex A
Metrosideros excelsa Xf subsp. multiplex A
Myrtus communis Xf subsp. multiplex A
Olea europaea Xf subsp. multiplex A
Olea europaea subsp. sylvestris Xf subsp. multiplex A
Olea sp. Xf subsp. multiplex A
Osteospermum ecklonis Xf subsp. multiplex A
Pelargonium graveolens Xf subsp. multiplex A
Pelargonium sp. Xf subsp. multiplex A
Periwinkle (common name) Xf subsp. multiplex A
Phagnalon saxatile Xf subsp. multiplex A
Phlomis fruticosa Xf subsp. multiplex A
Pistacia vera Xf subsp. multiplex A
Platanus occidentalis Xf subsp. multiplex A
Polygala myrtifolia Xf subsp. multiplex A
Polygala × grandiflora nana Xf subsp. multiplex A
Prunus armeniaca Xf subsp. multiplex A
Prunus avium Xf subsp. multiplex A
Prunus cerasifera Xf subsp. multiplex A
Prunus cerasus Xf subsp. multiplex A
Prunus domestica Xf subsp. multiplex A
Prunus dulcis Xf subsp. multiplex A
Prunus persica Xf subsp. multiplex A
Prunus salicina Xf subsp. multiplex A
Prunus sp. Xf subsp. multiplex A
Quercus coccinea Xf subsp. multiplex A
Quercus falcata Xf subsp. multiplex A
Quercus laevis Xf subsp. multiplex A
Quercus macrocarpa Xf subsp. multiplex A
Quercus nigra Xf subsp. multiplex A
Quercus palustris Xf subsp. multiplex A
Quercus phellos Xf subsp. multiplex A
Quercus robur Xf subsp. multiplex A
Quercus rubra Xf subsp. multiplex A
Quercus shumardii Xf subsp. multiplex A
Quercus sp. Xf subsp. multiplex A
Quercus suber Xf subsp. multiplex A
Ratibida columnifera Xf subsp. multiplex A
Rhamnus alaternus Xf subsp. multiplex A
Robinia pseudoacacia Xf subsp. multiplex A
Rosa canina Xf subsp. multiplex A
Rosa sp. Xf subsp. multiplex A
Rosmarinus officinalis Xf subsp. multiplex A
Rubus sp. Xf subsp. multiplex A
Salvia mellifera Xf subsp. multiplex A
Sambucus sp. Xf subsp. multiplex A
Santolina chamaecyparissus Xf subsp. multiplex A
Sapindus saponaria Xf subsp. multiplex A
Solidago virgaurea Xf subsp. multiplex A
Spartium junceum Xf subsp. multiplex A
Spartium sp. Xf subsp. multiplex A
Strelitzia reginae Xf subsp. multiplex A
Ulex europaeus Xf subsp. multiplex A
Ulex minor Xf subsp. multiplex A
Ulmus americana Xf subsp. multiplex A
Ulmus crassifolia Xf subsp. multiplex A
Vaccinium ashei Xf subsp. multiplex A
Vaccinium sp. Xf subsp. multiplex A
Vinca major Xf subsp. multiplex A
Vinca sp. Xf subsp. multiplex A
Westringia fruticosa Xf subsp. multiplex A
Xanthium strumarium Xf subsp. multiplex A
Acer platanoides Xf subsp. multiplex C
Cistus × incanus Xf subsp. multiplex C
Liriodendron tulipifera Xf subsp. multiplex C
Polygala sp. Xf subsp. multiplex C
Polygala × dalmaisiana Xf subsp. multiplex C
Vaccinium corymbosum Xf subsp. multiplex E
Plant species Pest Category
Acacia saligna Xf subsp. pauca A
Acacia sp. Xf subsp. pauca A
Amaranthus retroflexus Xf subsp. pauca A
Asparagus acutifolius Xf subsp. pauca A
Catharanthus roseus Xf subsp. pauca A
Chamaesyce canescens Xf subsp. pauca A
Chenopodium album Xf subsp. pauca A
Cistus creticus Xf subsp. pauca A
Citrus sinensis Xf subsp. pauca A
Citrus sp. Xf subsp. pauca A
Coffea arabica Xf subsp. pauca A
Coffea sp. Xf subsp. pauca A
Dodonaea viscosa Xf subsp. pauca A
Eremophila maculata Xf subsp. pauca A
Erigeron bonariensis Xf subsp. pauca A
Erigeron sp. Xf subsp. pauca A
Erigeron sumatrensis Xf subsp. pauca A
Euphorbia terracina Xf subsp. pauca A
Grevillea juniperina Xf subsp. pauca A
Hebe sp. Xf subsp. pauca A
Heliotropium europaeum Xf subsp. pauca A
Hibiscus rosa‐sinensis Xf subsp. pauca A
Laurus nobilis Xf subsp. pauca A
Lavandula angustifolia Xf subsp. pauca A
Lavandula dentata Xf subsp. pauca A
Lavandula stoechas Xf subsp. pauca A
Myoporum insulare Xf subsp. pauca A
Myrtus communis Xf subsp. pauca A
Nerium oleander Xf subsp. pauca A
Olea europaea Xf subsp. pauca A
Olea europaea subsp. sylvestris Xf subsp. pauca A
Osteospermum fruticosum Xf subsp. pauca A
Pelargonium fragrans Xf subsp. pauca A
Periwinkle (common name) Xf subsp. pauca A
Phillyrea latifolia Xf subsp. pauca A
Polygala myrtifolia Xf subsp. pauca A
Prunus avium Xf subsp. pauca A
Prunus domestica Xf subsp. pauca A
Prunus dulcis Xf subsp. pauca A
Rhamnus alaternus Xf subsp. pauca A
Rosmarinus officinalis Xf subsp. pauca A
Spartium junceum Xf subsp. pauca A
Vinca minor Xf subsp. pauca A
Westringia fruticosa Xf subsp. pauca A
Westringia glabra Xf subsp. pauca A
Prunus persica Xf subsp. pauca C
Quercus ilex Xf subsp. pauca C
Plant species Pest Category
Coffea sp. Xf subsp. sandyi A
Hemerocallis sp. Xf subsp. sandyi A
Jacaranda mimosifolia Xf subsp. sandyi A
Magnolia grandiflora Xf subsp. sandyi A
Nandina domestica Xf subsp. sandyi A
Nerium oleander Xf subsp. sandyi A
Polygala myrtifolia Xf subsp. sandyi C
Plant species Pest Category
Chitalpa tashkentensis Xf subsp. tashke A
Plant species Pest Category
Pyrus pyrifolia Xylella taiwanensis A

Appendix B – Host plant species artificially infected

1.

List of host plant species, artificially infected, of X. fastidiosa subsp. unknown (i.e. not reported in the publication), subsp. fastidiosa, subsp. morus, subsp. multiplex, subsp. pauca, subsp. sandyi and subsp. tashke according to categories A, B, C, D, E (as reported in Section 2.5.2):

A. Plant species positive with at least two detection methods (among: symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture) or positive with one method (between: sequencing, culture).

B. The same as point A, but also including microscopy: plant species positive with at least two detection methods (among: microscopy, symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture) or positive with one method (between: sequencing, culture).

C. Plant species positive with at least one detection method (among: symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture).

D. Plant species positive with at least one detection method including microscopy (microscopy, symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture).

E. All positives plant species reported, regardless of the detection methods (positive records but without the detection method specified, symptom observations, microscopy, symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing, culturing).

Plant species Pest Category
Acer macrophyllum Xf subsp. unknown A
Acer negundo Xf subsp. unknown A
Aesculus californica Xf subsp. unknown A
Alnus rhombifolia Xf subsp. unknown A
Ambrosia artemisiifolia Xf subsp. unknown A
Ambrosia sp. Xf subsp. unknown A
Arabidopsis thaliana Xf subsp. unknown A
Artemisia douglasiana Xf subsp. unknown A
Baccharis pilularis Xf subsp. unknown A
Baccharis salicifolia Xf subsp. unknown A
Brassica nigra Xf subsp. unknown A
Carya illinoinensis Xf subsp. unknown A
Catharanthus roseus Xf subsp. unknown A
Citrus aurantiifolia Xf subsp. unknown A
Citrus clementina Xf subsp. unknown A
Citrus clementina × C. sinensis Xf subsp. unknown A
Citrus jambhiri Xf subsp. unknown A
Citrus reshni Xf subsp. unknown A
Citrus reticulata Xf subsp. unknown A
Citrus sinensis Xf subsp. unknown A
Citrus sp. Xf subsp. unknown A
Citrus sunki Xf subsp. unknown A
Citrus unshiu Xf subsp. unknown A
Citrus × limonia Xf subsp. unknown A
Citrus × nobilis Xf subsp. unknown A
Coffea arabica Xf subsp. unknown A
Coffea sp. Xf subsp. unknown A
Conium maculatum Xf subsp. unknown A
Coprosma repens Xf subsp. unknown A
Coriandrum sativum Xf subsp. unknown A
Cyperus eragrostis Xf subsp. unknown A
Echinochloa crus‐galli Xf subsp. unknown A
Fagopyrum esculentum Xf subsp. unknown A
Fraxinus latifolia Xf subsp. unknown A
Hakea petiolaris Xf subsp. unknown A
Hedera helix Xf subsp. unknown A
Lobularia maritima Xf subsp. unknown A
Medicago sativa Xf subsp. unknown A
Morus alba Xf subsp. unknown A
Morus sp. Xf subsp. unknown A
Nerium oleander Xf subsp. unknown A
Nicotiana benthamiana Xf subsp. unknown A
Nicotiana tabacum Xf subsp. unknown A
Parthenocissus quinquefolia Xf subsp. unknown A
Periwinkle (common name) Xf subsp. unknown A
Persea americana Xf subsp. unknown A
Platanus occidentalis Xf subsp. unknown A
Populus fremontii Xf subsp. unknown A
Prunus cerasifera Xf subsp. unknown A
Prunus dulcis Xf subsp. unknown A
Prunus persica Xf subsp. unknown A
Prunus salicina Xf subsp. unknown A
Prunus sp. Xf subsp. unknown A
Pyrus pyrifolia Xf subsp. unknown A
Quercus agrifolia Xf subsp. unknown A
Quercus lobata Xf subsp. unknown A
Quercus rubra Xf subsp. unknown A
Rhus diversiloba Xf subsp. unknown A
Rosa californica Xf subsp. unknown A
Rubus hedycarpus subsp. procerus Xf subsp. unknown A
Rubus rigidus Xf subsp. unknown A
Rubus ursinus Xf subsp. unknown A
Salix laevigata Xf subsp. unknown A
Salix lasiolepis Xf subsp. unknown A
Salvia apiana Xf subsp. unknown A
Salvia mellifera Xf subsp. unknown A
Sambucus canadensis Xf subsp. unknown A
Sambucus sp. Xf subsp. unknown A
Spartium junceum Xf subsp. unknown A
Swainsona galegifolia Xf subsp. unknown A
Symphoricarpos albus Xf subsp. unknown A
Teline monspessulana Xf subsp. unknown A
Ulmus americana Xf subsp. unknown A
Umbellularia californica Xf subsp. unknown A
Urtica dioica Xf subsp. unknown A
Vaccinium corymbosum Xf subsp. unknown A
Vaccinium sp. Xf subsp. unknown A
Vicia sativa Xf subsp. unknown A
Vinca major Xf subsp. unknown A
Vinca minor Xf subsp. unknown A
Vitis arizonica × V. rupestris Xf subsp. unknown A
Vitis arizonica/candicans × V. rupestris Xf subsp. unknown A
Vitis californica Xf subsp. unknown A
Vitis labrusca × V. vinifera Xf subsp. unknown A
Vitis rotundifolia Xf subsp. unknown A
Vitis rotundifolia × V. rupestris Xf subsp. unknown A
Vitis rupestris Xf subsp. unknown A
Vitis sp. Xf subsp. unknown A
Vitis vinifera Xf subsp. unknown A
Morus rubra Xf subsp. unknown B
Prunus domestica Xf subsp. unknown B
Vitis arizonica/candicans Xf subsp. unknown B
Vitis aestivalis var. smalliana Xf subsp. unknown B
Vitis rufotomentosa Xf subsp. unknown B
Ambrosia acanthicarpa Xf subsp. unknown C
Ambrosia trifida var. texana Xf subsp. unknown C
Amsinckia douglasiana Xf subsp. unknown C
Anisantha rigida Xf subsp. unknown C
Avena fatua Xf subsp. unknown C
Brachiaria plantaginea Xf subsp. unknown C
Bromus sp. Xf subsp. unknown C
Callistephus chinensis Xf subsp. unknown C
Canna sp. Xf subsp. unknown C
Ceratochloa cathartica Xf subsp. unknown C
Citrus deliciosa × C. sinensis Xf subsp. unknown C
Citrus medica Xf subsp. unknown C
Citrus tangerina Xf subsp. unknown C
Citrus × tangelo Xf subsp. unknown C
Clarkia amoena subsp. lindleyi Xf subsp. unknown C
Coprosma baueri Xf subsp. unknown C
Cotoneaster rotundifolius Xf subsp. unknown C
Cynodon dactylon Xf subsp. unknown C
Cyperus esculentus Xf subsp. unknown C
Cytisus scoparius Xf subsp. unknown C
Daucus carota subsp. sativus Xf subsp. unknown C
Digitaria sanguinalis Xf subsp. unknown C
Dysphania ambrosioides Xf subsp. unknown C
Epilobium brachycarpum Xf subsp. unknown C
Epilobium ciliatum Xf subsp. unknown C
Eragrostis diffusa Xf subsp. unknown C
Erodium cicutarium Xf subsp. unknown C
Fallopia convolvulus Xf subsp. unknown C
Grevillea alpina Xf subsp. unknown C
Helianthus annuus Xf subsp. unknown C
Hordeum murinum Xf subsp. unknown C
Hordeum vulgare Xf subsp. unknown C
Iva annua Xf subsp. unknown C
Lactuca serriola Xf subsp. unknown C
Lathyrus cicera Xf subsp. unknown C
Lathyrus clymenum Xf subsp. unknown C
Lathyrus sativus Xf subsp. unknown C
Leptospermum laevigatum Xf subsp. unknown C
Lolium multiflorum Xf subsp. unknown C
Lolium temulentum Xf subsp. unknown C
Lonicera japonica Xf subsp. unknown C
Melilotus albus Xf subsp. unknown C
Melilotus albus var. annuus Xf subsp. unknown C
Melilotus indicus Xf subsp. unknown C
Melilotus officinalis Xf subsp. unknown C
Mentha sp. Xf subsp. unknown C
Oenanthe sarmentosa Xf subsp. unknown C
Oenothera elata Xf subsp. unknown C
Olea europaea Xf subsp. unknown C
Parthenocissus tricuspidata Xf subsp. unknown C
Paspalum dilatatum Xf subsp. unknown C
Pelargonium × hortorum Xf subsp. unknown C
Pennisetum clandestinum Xf subsp. unknown C
Pennisetum glaucum Xf subsp. unknown C
Persicaria maculosa Xf subsp. unknown C
Phalaris minor Xf subsp. unknown C
Phalaris paradoxa Xf subsp. unknown C
Phleum pratense Xf subsp. unknown C
Photinia arbutifolia Xf subsp. unknown C
Pittosporum crassifolium Xf subsp. unknown C
Platanus sp. Xf subsp. unknown C
Poa annua Xf subsp. unknown C
Poncirus trifoliata Xf subsp. unknown C
Reseda odorata Xf subsp. unknown C
Rheum rhaponticum Xf subsp. unknown C
Rubus vitifolius Xf subsp. unknown C
Rumex crispus Xf subsp. unknown C
Sambucus cerulea Xf subsp. unknown C
Sonchus asper Xf subsp. unknown C
Sorghum halepense Xf subsp. unknown C
Sorghum × drummondii Xf subsp. unknown C
Syringa vulgaris Xf subsp. unknown C
Syzygium paniculatum Xf subsp. unknown C
Trifolium fragiferum Xf subsp. unknown C
Trifolium hybridum Xf subsp. unknown C
Trifolium incarnatum Xf subsp. unknown C
Trifolium pratense Xf subsp. unknown C
Trifolium repens Xf subsp. unknown C
Trifolium repens var. latum Xf subsp. unknown C
Urtica dioica subsp. gracilis Xf subsp. unknown C
Vicia monantha Xf subsp. unknown C
Vitis acerifolia Xf subsp. unknown C
Vitis aestivalis Xf subsp. unknown C
Vitis arizonica Xf subsp. unknown C
Vitis arizonica hybrid Xf subsp. unknown C
Vitis arizonica/girdiana Xf subsp. unknown C
Vitis arizonica/girdiana × V. rupestris Xf subsp. unknown C
Vitis berlandieri Xf subsp. unknown C
Vitis candicans Xf subsp. unknown C
Vitis cinerea Xf subsp. unknown C
Vitis cinerea × V. berlandieri Xf subsp. unknown C
Vitis girdiana Xf subsp. unknown C
Vitis labrusca Xf subsp. unknown C
Vitis lincecumii Xf subsp. unknown C
Vitis monticola Xf subsp. unknown C
Vitis munsoniana Xf subsp. unknown C
Vitis palmata Xf subsp. unknown C
Vitis simpsonii Xf subsp. unknown C
Vitis tiliaefolia Xf subsp. unknown C
Vitis vulpina Xf subsp. unknown C
Vitis × champinii Xf subsp. unknown C
Vitis aestivalis var. smalliana × V. simpsonii Xf subsp. unknown C
Vitis bloodwothiana Xf subsp. unknown C
Vitis nesbittiana Xf subsp. unknown C
Vitis shuttleworthii Xf subsp. unknown C
Vulpia myuros Xf subsp. unknown C
Xanthium orientale Xf subsp. unknown C
(Prunus salicina × P. angustifolia) × (P. salicina × P. munsoniana) Xf subsp. unknown D
Prunus angustifolia Xf subsp. unknown D
Prunus avium Xf subsp. unknown D
Prunus cerasifera × P. salicina Xf subsp. unknown D
Prunus salicina × (P. salicina × P. cerasifera) Xf subsp. unknown D
Vitis arizonica × V. vinifera Xf subsp. unknown D
Chenopodium quinoa Xf subsp. unknown E
Citroncirus webberi Xf subsp. unknown E
Citrus macrophylla Xf subsp. unknown E
Nicotiana clevelandii Xf subsp. unknown E
Prunus armeniaca Xf subsp. unknown E
Prunus hortulana Xf subsp. unknown E
Prunus mexicana Xf subsp. unknown E
Prunus mume Xf subsp. unknown E
Plant species Pest Category
Amaranthus blitoides Xf subsp. fastidiosa A
Ambrosia acanthicarpa Xf subsp. fastidiosa A
Ambrosia artemisiifolia Xf subsp. fastidiosa A
Catharanthus roseus Xf subsp. fastidiosa A
Chenopodium quinoa Xf subsp. fastidiosa A
Conium maculatum Xf subsp. fastidiosa A
Convolvulus arvensis Xf subsp. fastidiosa A
Cyperus esculentus Xf subsp. fastidiosa A
Datura wrightii Xf subsp. fastidiosa A
Echinochloa crus‐galli Xf subsp. fastidiosa A
Erigeron canadensis Xf subsp. fastidiosa A
Eriochloa gracilis Xf subsp. fastidiosa A
Erodium moschatum Xf subsp. fastidiosa A
Eucalyptus camaldulensis Xf subsp. fastidiosa A
Eucalyptus globulus Xf subsp. fastidiosa A
Helianthus annuus Xf subsp. fastidiosa A
Ipomoea purpurea Xf subsp. fastidiosa A
Lactuca serriola Xf subsp. fastidiosa A
Malva parviflora Xf subsp. fastidiosa A
Medicago sativa Xf subsp. fastidiosa A
Nicotiana glauca Xf subsp. fastidiosa A
Nicotiana tabacum Xf subsp. fastidiosa A
Portulaca oleracea Xf subsp. fastidiosa A
Prunus dulcis Xf subsp. fastidiosa A
Prunus sp. Xf subsp. fastidiosa A
Rubus ursinus Xf subsp. fastidiosa A
Rumex crispus Xf subsp. fastidiosa A
Simmondsia chinensis Xf subsp. fastidiosa A
Solanum lycopersicum Xf subsp. fastidiosa A
Solanum melongena Xf subsp. fastidiosa A
Sonchus oleraceus Xf subsp. fastidiosa A
Sorghum halepense Xf subsp. fastidiosa A
Vicia faba Xf subsp. fastidiosa A
Vicia sativa Xf subsp. fastidiosa A
Vitis sp. Xf subsp. fastidiosa A
Vitis vinifera Xf subsp. fastidiosa A
Xanthium strumarium Xf subsp. fastidiosa A
Arabidopsis thaliana Xf subsp. fastidiosa B
Dendranthema × grandiflorum Xf subsp. fastidiosa C
Olea europaea Xf subsp. fastidiosa C
Prunus dulcis × P. webbii Xf subsp. fastidiosa C
Prunus persica Xf subsp. fastidiosa C
Prunus persica × P. webbii Xf subsp. fastidiosa C
Prunus webbii Xf subsp. fastidiosa C
Rubus rigidus Xf subsp. fastidiosa C
Sambucus canadensis Xf subsp. fastidiosa C
Vaccinium corymbosum Xf subsp. fastidiosa C
Vinca major Xf subsp. fastidiosa C
Vitis arizonica/candicans Xf subsp. fastidiosa C
Vitis californica Xf subsp. fastidiosa C
Liquidambar styraciflua Xf subsp. fastidiosa E
Vaccinium sp. Xf subsp. fastidiosa E
Vitis champinii × (V. solonis × V. othello) Xf subsp. fastidiosa E
Plant species Pest Category
Morus alba Xf subsp. morus A
Nerium oleander Xf subsp. morus A
Plant species Pest Category
Acer rubrum Xf subsp. multiplex A
Ambrosia artemisiifolia Xf subsp. multiplex A
Carya illinoinensis Xf subsp. multiplex A
Liquidambar styraciflua Xf subsp. multiplex A
Medicago sativa Xf subsp. multiplex A
Nicotiana tabacum Xf subsp. multiplex A
Olea europaea Xf subsp. multiplex A
Pistacia vera Xf subsp. multiplex A
Platanus occidentalis Xf subsp. multiplex A
Polygala myrtifolia Xf subsp. multiplex A
Prunus cerasifera Xf subsp. multiplex A
Prunus dulcis Xf subsp. multiplex A
Prunus persica Xf subsp. multiplex A
Prunus sp. Xf subsp. multiplex A
Quercus falcata Xf subsp. multiplex A
Rubus fruticosus Xf subsp. multiplex A
Rubus ursinus Xf subsp. multiplex A
Vitis vinifera Xf subsp. multiplex A
Catharanthus roseus Xf subsp. multiplex C
Prunus persica × P. webbii Xf subsp. multiplex C
Prunus webbii Xf subsp. multiplex C
Vaccinium corymbosum Xf subsp. multiplex C
Vaccinium sp. Xf subsp. multiplex E
Plant species Pest Category
Brachiaria decumbens Xf subsp. pauca A
Brachiaria plantaginea Xf subsp. pauca A
Catharanthus roseus Xf subsp. pauca A
Citrus reticulata Xf subsp. pauca A
Citrus sinensis Xf subsp. pauca A
Citrus sp. Xf subsp. pauca A
Citrus × nobilis Xf subsp. pauca A
Coffea arabica Xf subsp. pauca A
Coffea sp. Xf subsp. pauca A
Echinochloa crus‐galli Xf subsp. pauca A
Nerium oleander Xf subsp. pauca A
Nicotiana clevelandii Xf subsp. pauca A
Nicotiana tabacum Xf subsp. pauca A
Olea europaea Xf subsp. pauca A
Polygala myrtifolia Xf subsp. pauca A
Arabidopsis thaliana Xf subsp. pauca B
Bidens pilosa Xf subsp. pauca C
Chenopodium album Xf subsp. pauca C
Digitaria horizontalis Xf subsp. pauca C
Medicago sativa Xf subsp. pauca C
Periwinkle (common name) Xf subsp. pauca C
Prunus avium Xf subsp. pauca C
Prunus dulcis Xf subsp. pauca C
Solanum americanum Xf subsp. pauca C
Plant species Pest Category
Catharanthus roseus Xf subsp. sandyi A
Medicago sativa Xf subsp. sandyi A
Nerium oleander Xf subsp. sandyi A
Prunus dulcis Xf subsp. sandyi A
Vinca major Xf subsp. sandyi A
Nicotiana tabacum Xf subsp. sandyi C
Plant species Pest Category
Nicotiana benthamiana Xf subsp. tashke C

Appendix C – Host plant species infected in unspecified conditions

1.

List of host plant species, infected in unspecified conditions, of X. fastidiosa subsp. unknown (i.e. not reported in the publication), subsp. fastidiosa, subsp. multiplex, subsp. pauca and subsp. sandyi according to categories A, B, C, D, E (as reported in Section 2.5.2):

A. Plant species positive with at least two detection methods (among: symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture) or positive with one method (between: sequencing, culture).

B. The same as point A, but also including microscopy: plant species positive with at least two detection methods (among: microscopy, symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture) or positive with one method (between: sequencing, culture).

C. Plant species positive with at least one detection method (among: symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture).

D. Plant species positive with at least one detection method including microscopy (microscopy, symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing and culture).

E. All positives plant species reported, regardless of the detection methods (positive records but without the detection method specified, symptom observations, microscopy, symptoms observation on the test plant in experimental vector transmission, ELISA, other immunological techniques, PCR‐based methods, sequencing, culturing).

Plant species Pest Category
Ampelopsis arborea Xf subsp. unknown A
Catharanthus roseus Xf subsp. unknown A
Catharanthus sp. Xf subsp. unknown A
Citrus jambhiri Xf subsp. unknown A
Citrus sinensis Xf subsp. unknown A
Coffea arabica Xf subsp. unknown A
Hibiscus schizopetalus Xf subsp. unknown A
Morus nigra Xf subsp. unknown A
Nerium oleander Xf subsp. unknown A
Prunus persica Xf subsp. unknown A
Prunus sp. Xf subsp. unknown A
Sambucus canadensis Xf subsp. unknown A
Vitis munsoniana Xf subsp. unknown A
Vitis rotundifolia Xf subsp. unknown A
Vitis sp. Xf subsp. unknown A
Vitis vinifera Xf subsp. unknown A
Ambrosia sp. Xf subsp. unknown B
Periwinkle (common name) Xf subsp. unknown B
Acer sp. Xf subsp. unknown C
Carya illinoinensis Xf subsp. unknown C
Citrus sp. Xf subsp. unknown C
Prunus dulcis Xf subsp. unknown C
Prunus salicina Xf subsp. unknown C
Pyrus sp. Xf subsp. unknown C
Teline monspessulana Xf subsp. unknown C
Vaccinium darrowii Xf subsp. unknown C
Vaccinium sp. Xf subsp. unknown C
Prunus angustifolia Xf subsp. unknown D
Vitis labrusca Xf subsp. unknown D
Morus sp. Xf subsp. unknown E
Nicotiana tabacum Xf subsp. unknown E
Plant species Pest Category
Ambrosia artemisiifolia Xf subsp. fastidiosa A
Lupinus sp. Xf subsp. fastidiosa A
Prunus dulcis Xf subsp. fastidiosa A
Sambucus sp. Xf subsp. fastidiosa A
Vitis rotundifolia Xf subsp. fastidiosa A
Vitis sp. Xf subsp. fastidiosa A
Vitis vinifera Xf subsp. fastidiosa A
Plant species Pest Category
Ambrosia trifida Xf subsp. multiplex A
Morus sp. Xf subsp. multiplex A
Platanus sp. Xf subsp. multiplex A
Prunus cerasifera Xf subsp. multiplex A
Prunus domestica Xf subsp. multiplex A
Prunus dulcis Xf subsp. multiplex A
Prunus salicina Xf subsp. multiplex A
Quercus sp. Xf subsp. multiplex A
Rubus fruticosus Xf subsp. multiplex A
Rubus sp. Xf subsp. multiplex A
Vaccinium corymbosum Xf subsp. multiplex A
Vaccinium corymbosum × V. angustifolium hybrid Xf subsp. multiplex A
Vinca sp. Xf subsp. multiplex A
Liquidambar styraciflua Xf subsp. multiplex C
Quercus laevis Xf subsp. multiplex C
Quercus rubra Xf subsp. multiplex C
Plant species Pest Category
Citrus sinensis Xf subsp. pauca A
Citrus sp. Xf subsp. pauca A
Coffea sp. Xf subsp. pauca A
Hibiscus fragilis Xf subsp. pauca A
Hibiscus sp. Xf subsp. pauca A
Nerium oleander Xf subsp. pauca A
Prunus domestica Xf subsp. pauca A
Prunus sp. Xf subsp. pauca A
Plant species Pest Category
Coffea arabica Xf subsp. sandyi A
Nerium oleander Xf subsp. sandyi C

Appendix D – Xylella fastidiosa Multilocus Sequence Types

1.

Number of records for each plant species natural, artificial and infected in unspecified conditions by different multilocus sequence types (STs). The records for natural infection are divided per country. In general, the subspecies and the STs are reported as in the publication. If the subspecies and/or the STs are inferred from another publication or obtained from personal communication of the author of the publication, a note is added in the genotyping comment column of the excel file available in Zenodo in the EFSA Knowledge Junction community (https://doi.org/10.5281/zenodo.1339343).

X. fastidiosa subspecies/sequence type Natural infection Artificial infection Unspecified infection Grand Total
Argentina Brazil Costa Rica Ecuador France Honduras Italy Mexico Portugal Spain USA unknown Total Total Total
fastidiosa 22 3 14 98 137 96 9 242
ST1 3 14 85 102 95 2 199
Acer sp. 1 1 1
Amaranthus blitoides 1 1
Ambrosia acanthicarpa 2 2
Calicotome spinosa 1 1 1
Catharanthus roseus 2 2
Cercis occidentalis 1 1 1
Chenopodium quinoa 2 2
Cistus monspeliensis 1 1 1
Citrus sinensis 1 1 1
Conium maculatum 2 2
Convolvulus arvensis 1 1
Cyperus esculentus 1 1
Datura wrightii 1 1
Echinochloa crus‐galli 1 1
Erigeron canadensis 1 1
Eriochloa gracilis 1 1
Erodium moschatum 2 2
Eucalyptus camaldulensis 2 2
Eucalyptus globulus 1 1
Genista lucida 1 1 1
Helianthus annuus 3 3
Ipomoea purpurea 2 2
Juglans regia 1 1 1
Lactuca serriola 3 3
Malva parviflora 2 2
Medicago sativa 3 3 11 14
Metrosideros sp. 1 1 1
Nicotiana glauca 2 2
Olea europaea 1 1
Pluchea odorata 1 1 1
Polygala myrtifolia 2 2 2
Portulaca oleracea 1 1
Prunus avium 3 2 5 5
Prunus dulcis 1 19 20 18 1 39
Rhamnus alaternus 1 1 1
Rubus ursinus 2 2
Rumex crispus 1 1
Sambucus canadensis 2 2 2
Simmondsia chinensis 2 2
Solanum lycopersicum 1 1
Solanum melongena 1 1
Sonchus oleraceus 1 1
Sorghum halepense 1 1
Spartium junceum 1 1 1
Vicia faba 1 1
Vicia sativa 1 1
Vitis aestivalis 2 2 2
Vitis girdiana 1 1 1
Vitis sp. 2 31 33 1 34
Vitis vinifera 1 3 19 23 18 41
Xanthium strumarium 3 3
ST2 8 8 7 15
Ambrosia artemisiifolia 1 1
Vitis rotundifolia 3 3 1 4
Vitis sp. 5 5 5
Vitis vinifera 5 5
ST3 1 1 1
Lupinus aridorum 1 1 1
ST4 4 4 1 5
Medicago sativa 1 1
Vitis sp. 4 4 4
ST17 1 1 1
Coffea arabica 1 1 1
ST18 1 1 1
Vitis sp. 1 1 1
ST19 1 1 1
Coffea arabica 1 1 1
ST20 1 1 1
Coffea arabica 1 1 1
ST21 1 1 1
Coffea arabica 1 1 1
ST33 1 1 1
Coffea arabica 1 1 1
ST47 2 2 2
Coffea arabica 1 1 1
Vitis sp. 1 1 1
ST52 1 1 1
Coffea arabica 1 1 1
ST54 1 1 1
Coffea arabica 1 1 1
ST55 1 1 1
Coffea arabica 1 1 1
ST56 1 1 1
Coffea arabica 1 1 1
ST57 1 1 1
Coffea arabica 1 1 1
ST59 1 1 1
Vitis vinifera 1 1 1
ST60 1 1 1
Vitis vinifera 1 1 1
ST61 3 3 3
Citrus sinensis 1 1 1
Coffea arabica 2 2 2
ST72 1 1 1
Coffea arabica 1 1 1
ST76 2 2 2
Coffea arabica 2 2 2
ST77 1 1 1
Coffea arabica 1 1 1
fastidiosa/sandyi 3 1 4 4
ST72 2 2 2
Coffea arabica 2 2 2
ST75 1 1 1
Coffea canephora 1 1 1
ST76 1 1 1
Coffea arabica 1 1 1
morus 22 22 22
ST29 7 7 7
Morus alba 3 3 3
Morus rubra 4 4 4
ST30 5 5 5
Morus alba 4 4 4
Nandina domestica 1 1 1
ST31 6 6 6
Morus sp. 6 6 6
ST62 4 4 4
Morus alba 4 4 4
multiplex 3 81 23 15 32 163 317 43 16 376
ST6 2 13 10 25 17 1 43
Calicotome spinosa 1 1 1
Catharanthus roseus 1 1
Helichrysum italicum 1 1 1
Medicago sativa 4 4
Nicotiana tabacum 1 1
Olea europaea 1 1 1 2
Phagnalon saxatile 1 1 1
Polygala myrtifolia 1 1 1 2
Prunus armeniaca 1 1 1
Prunus cerasifera 1 1
Prunus domestica 1 1 1
Prunus dulcis 4 10 14 5 1 20
Rhamnus alaternus 1 1 1
Rosmarinus officinalis 1 1 1
Rubus ursinus 1 1
Spartium junceum 2 2 2
Vitis vinifera 2 2
ST6 and ST7 1 1 1
Cistus monspeliensis 1 1 1
ST6 and/or ST7 76 76 76
Acacia dealbata 1 1 1
Acer pseudoplatanus 2 2 2
Anthyllis hermanniae 1 1 1
Artemisia arborescens 2 2 2
Asparagus acutifolius 2 2 2
Calicotome villosa 1 1 1
Cercis siliquastrum 1 1 1
Cistus creticus 1 1 1
Cistus monspeliensis 2 2 2
Cistus salviifolius 2 2 2
Coronilla valentina 2 2 2
Cytisus scoparius 1 1 1
Cytisus sp. 2 2 2
Cytisus villosus 1 1 1
Euryops chrysanthemoides 1 1 1
Genista corsica 1 1 1
Genista ephedroides 2 2 2
Genista × spachiana 2 2 2
Hebe sp. 2 2 2
Helichrysum italicum 3 3 3
Lavandula angustifolia 2 2 2
Lavandula dentata 2 2 2
Lavandula sp. 3 3 3
Lavandula stoechas 2 2 2
Lavandula × heterophylla 2 2 2
Lavandula × intermedia 3 3 3
Medicago sativa 1 1 1
Metrosideros excelsa 2 2 2
Myrtus communis 2 2 2
Pelargonium graveolens 2 2 2
Pelargonium sp. 2 2 2
Phagnalon saxatile 1 1 1
Polygala myrtifolia 7 7 7
Polygala sp. 1 1 1
Prunus cerasifera 2 2 2
Prunus dulcis 1 1 1
Quercus suber 2 2 2
Rosa canina 1 1 1
Rosmarinus officinalis 2 2 2
Spartium junceum 3 3 3
Westringia fruticosa 1 1 1
ST7 1 15 2 10 28 16 44
Acacia longifolia 1 1 1
Artemisia arborescens 1 1 1
Artemisia sp. 1 1 1
Catharanthus roseus 1 1
Coprosma repens 1 1 1
Cytisus scoparius 1 1 1
Dodonaea viscosa 1 1 1
Ilex aquifolium 1 1 1
Lavandula angustifolia 1 1 1
Lavandula dentata 1 1 1
Medicago sativa 2 2
Myrtus communis 1 1 1
Nicotiana tabacum 1 1
Olea europaea 1 1 4 5
Olea sp. 1 1 1
Polygala myrtifolia 1 1 2 1 3
Prunus cerasifera 1 1
Prunus dulcis 1 4 5 4 9
Prunus sp. 1 1 1
Quercus suber 1 1 1
Rosmarinus officinalis 1 1 1
Rubus fruticosus 1 1
Salvia mellifera 3 3 3
Ulex europaeus 1 1 1
Ulex minor 1 1 1
Vinca major 1 1 1
Vitis vinifera 1 1
ST8 9 9 9
Alnus rhombifolia 1 1 1
Carya illinoinensis 1 1 1
Platanus occidentalis 5 5 5
Quercus palustris 1 1 1
Ulmus americana 1 1 1
ST9 28 28 2 30
Quercus coccinea 2 2 2
Quercus falcata 1 1 1 2
Quercus laevis 2 2 2
Quercus nigra 1 1 1
Quercus palustris 11 11 11
Quercus phellos 1 1 1
Quercus robur 1 1 1
Quercus rubra 5 5 5
Quercus shumardii 1 1 1
Quercus sp. 3 3 3
Rubus fruticosus 1 1
ST10 7 7 7
Prunus domestica 2 2 2
Prunus persica 3 3 3
Prunus sp. 2 2 2
ST15 3 3 3
Prunus cerasifera 3 3 3
ST22 3 3 1 4
Ambrosia psilostachya 1 1 1
Ambrosia trifida 2 2 1 3
ST23 10 10 10
Acer rubrum 1 1 1
Ambrosia trifida 2 2 2
Helianthus sp. 2 2 2
Iva annua 1 1 1
Quercus rubra 1 1 1
Ratibida columnifera 2 2 2
Solidago virgaurea 1 1 1
ST24 5 5 3 8
Cercis occidentalis 1 1 1
Liquidambar styraciflua 3 3 2 5
Prunus dulcis 1 1
Ulmus crassifolia 1 1 1
ST25 4 4 4
Encelia farinosa 4 4 4
ST26 1 12 13 4 17
Alnus rhombifolia 1 1 1
Prunus cerasifera 2 2 1 3
Prunus domestica 1 1 2 2
Prunus dulcis 1 1
Prunus persica 1 1
Prunus sp. 8 8 8
Rubus fruticosus 1 1
ST27 6 6 2 8
Ginkgo biloba 1 1 1
Lagerstroemia sp. 1 1 1
Prunus cerasifera 1 1
Prunus dulcis 2 2 1 3
Prunus sp. 2 2 2
ST28 4 4 1 5
Ambrosia trifida 2 2 1 3
Helianthus sp. 1 1 1
Iva annua 1 1 1
ST32 2 2 1 3
Rubus fruticosus 1 1
Rubus sp. 2 2 2
ST34 1 1 1
Prunus cerasifera 1 1 1
ST35 1 1 1
Xanthium strumarium 1 1 1
ST36 1 1 1 2
Prunus cerasifera 1 1
Prunus sp. 1 1 1
ST37 1 1 1
Lupinus villosus 1 1 1
ST38 1 1 1
Platanus occidentalis 1 1 1
ST39 6 6 6
Koelreuteria bipinnata 1 1 1
Liquidambar styraciflua 4 4 4
Prunus sp. 1 1 1
ST40 4 4 1 5
Prunus cerasifera 3 3 1 4
Sambucus sp. 1 1 1
ST41 3 3 2 5
Prunus domestica 1 1
Prunus salicina 1 1
Prunus sp. 1 1 1
Ulmus americana 2 2 2
ST42 8 8 3 11
Ambrosia trifida 2 2 1 3
Sapindus saponaria 1 1 1
Vaccinium ashei 2 2 2
Vaccinium corymbosum 1 1
Vaccinium corymbosum × V. angustifolium hybrid 1 1
Vaccinium sp. 3 3 3
ST43 4 4 2 6
Vaccinium corymbosum 1 1
Vaccinium corymbosum × V. angustifolium hybrid 1 1
Vaccinium sp. 4 4 4
ST44 2 2 2
Quercus palustris 1 1 1
Quercus rubra 1 1 1
ST45 6 6 6
Acer griseum 1 1 1
Ampelopsis cordata 1 1 1
Cercis canadensis 3 3 3
Gleditsia triacanthos 1 1 1
ST46 3 3 3
Celtis occidentalis 1 1 1
Chionanthus sp. 1 1 1
Prunus armeniaca 1 1 1
ST48 1 1 1
Sapindus saponaria 1 1 1
ST49 1 1 1
Prunus sp. 1 1 1
ST50 2 2 2
Fraxinus americana 1 1 1
Fraxinus sp. 1 1 1
ST51 2 2 1 3
Periwinkle (common name) 1 1 1
Vinca sp. 1 1 1 2
ST58 1 1 1 2
Ambrosia trifida 1 1 1 2
ST63 1 1 1
Prunus domestica 1 1 1
ST67 1 1 1
Prunus domestica 1 1 1
ST79 1 1 1
Polygala myrtifolia 1 1 1
ST81 17 17 17
Acacia sp. 1 1 1
Ficus carica 2 2 2
Fraxinus angustifolia 1 1 1
Lavandula dentata 1 1 1
Olea europaea 2 2 2
Olea europaea subsp. sylvestris 2 2 2
Polygala myrtifolia 2 2 2
Prunus domestica 1 1 1
Prunus dulcis 2 2 2
Rhamnus alaternus 1 1 1
Rosmarinus officinalis 2 2 2
ST82 1 1 1
Vaccinium ashei 1 1 1
ST83 1 1 1
Vaccinium ashei 1 1 1
ST87 23 23 23
Calicotome spinosa 1 1 1
Cercis siliquastrum 1 1 1
Cistus monspeliensis 1 1 1
Cistus salviifolius 1 1 1
Cistus sp. 2 2 2
Cytisus scoparius 1 1 1
Elaeagnus angustifolia 1 1 1
Ficus carica 1 1 1
Helichrysum sp. 1 1 1
Lavandula angustifolia 1 1 1
Lavandula sp. 1 1 1
Polygala myrtifolia 3 3 3
Prunus dulcis 2 2 2
Rhamnus alaternus 2 2 2
Rosmarinus officinalis 2 2 2
Spartium junceum 2 2 2
pauca 5 117 8 2 4 233 7 2 378 127 22 527
ST11 49 49 14 3 66
Catharanthus roseus 2 2
Citrus sinensis 19 19 4 3 26
Citrus sp. 29 29 29
Coffea arabica 4 4
Coffea sp. 1 1 1
Nicotiana tabacum 4 4
ST12 3 3 3 6
Citrus sinensis 2 2 2 4
Citrus sp. 1 1 1 2
ST13 8 8 42 2 52
Catharanthus roseus 6 6
Citrus reticulata 3 3
Citrus sinensis 2 2 10 2 14
Citrus sp. 6 6 21 27
Nicotiana tabacum 1 1
Periwinkle (common name) 1 1
ST14 7 7 4 11
Coffea arabica 1 1 1
Coffea sp. 6 6 2 8
Prunus domestica 1 1
Prunus sp. 1 1
ST16 39 39 15 1 55
Citrus sinensis 1 1
Coffea arabica 1 1 7 8
Coffea sp. 17 17 1 18
Nicotiana tabacum 6 6
Olea europaea 21 21 1 22
ST53 7 4 233 1 245 52 6 303
Acacia saligna 1 1 1
Amaranthus retroflexus 3 3 3
Asparagus acutifolius 2 2 2
Catharanthus roseus 2 2 5 7
Chamaesyce canescens 2 2 2
Chenopodium album 5 5 1 6
Cistus creticus 1 1 1
Coffea arabica 2 2 2
Coffea sp. 1 1 2 3
Dodonaea viscosa 1 1 1
Eremophila maculata 1 1 1
Erigeron bonariensis 3 3 3
Erigeron sp. 6 6 6
Erigeron sumatrensis 1 1 1
Euphorbia terracina 1 1 1
Grevillea juniperina 1 1 1
Hebe sp. 1 1 1
Heliotropium europaeum 3 3 3
Laurus nobilis 1 1 1
Lavandula angustifolia 1 1 1
Lavandula stoechas 1 1 1
Myoporum insulare 1 1 1
Myrtus communis 1 1 1
Nerium oleander 5 8 13 6 4 23
Nicotiana tabacum 4 4
Olea europaea 1 154 155 25 180
Osteospermum fruticosum 1 1 1
Pelargonium fragrans 1 1 1
Periwinkle (common name) 1 1 1
Phillyrea latifolia 1 1 1
Polygala myrtifolia 1 7 8 5 13
Prunus avium 8 8 2 10
Prunus dulcis 4 4 4 8
Prunus persica 1 1 1
Quercus ilex 1 1 1
Rhamnus alaternus 1 1 1
Rosmarinus officinalis 1 1 1
Spartium junceum 1 1 1
Vinca minor 1 1 1
Westringia fruticosa 4 4 4
Westringia glabra 1 1 1
ST64 1 1 1
Citrus sinensis 1 1 1
ST65 1 1 2 3
Catharanthus roseus 2 2
Citrus sinensis 1 1 1
ST66 1 1 1
Coffea arabica 1 1 1
ST68 1 1 1
Coffea arabica 1 1 1
ST69 4 4 1 5
Citrus sinensis 3 3 1 4
Olea europaea 1 1 1
ST70 1 1 2 2 5
Catharanthus roseus 2 2
Hibiscus fragilis 1 1
Hibiscus rosa‐sinensis 1 1 1
Hibiscus sp. 1 1
ST71 1 1 1
Prunus domestica 1 1 1
ST73 1 1 1
Coffea arabica 1 1 1
ST73 and ST53 1 1 1
Coffea arabica 1 1 1
ST74 2 2 2
Coffea arabica 2 2 2
ST78 1 1 1
Prunus dulcis 1 1 1
ST80 7 7 7
Acacia sp. 1 1 1
Lavandula dentata 1 1 1
Olea europaea 1 1 1
Olea europaea subsp. sylvestris 1 1 1
Polygala myrtifolia 1 1 1
Prunus dulcis 1 1 1
Rosmarinus officinalis 1 1 1
ST84 3 3 3
Olea europaea 3 3 3
ST85 1 1 1
Olea europaea 1 1 1
ST86 1 1 1
Olea europaea 1 1 1
sandyi 1 1 1 23 26 4 1 31
ST5 23 23 4 27
Hemerocallis sp. 1 1 1
Jacaranda mimosifolia 1 1 1
Magnolia grandiflora 1 1 1
Nerium oleander 20 20 1 21
Prunus dulcis 1 1
Vinca major 2 2
ST72 1 1 1 2
Coffea arabica 1 1
Coffea sp. 1 1 1
ST76 1 1 2 2
Coffea sp. 1 1 1
Polygala myrtifolia 1 1 1
Grand Total 5 120 34 2 86 1 256 4 15 53 306 2 884 270 48 1,202

Suggested citation: EFSA (European Food Safety Authority) , 2020. Scientific report on the update of the Xylella spp. host plant database – systematic literature search up to 30 June 2019. EFSA Journal 2020;18(4):6114, 61 pp. 10.2903/j.efsa.2020.6114

Requestor: European Commission

Question number: EFSA‐Q‐2017‐00216

Acknowledgements: EFSA wishes to thank the following EFSA staff members for the support provided to this scientific output: Alice Delbianco, Andrea Maiorano and Giuseppe Stancanelli in ALPHA Unit; Davide Gibin, Elisa Palmas, Mario Monguidi and Luca Pasinato in DATA Unit; Irene Muñoz Guajardo in AMU Unit. A special acknowledgement to Michela Guzzo (trainee in ALPHA Unit, Plant Health team) for her support in the update of the Xylella spp. host plants database. EFSA wishes also to thank Claude Bragard (Chair of EFSA Panel of Plant Health) for reviewing this scientific report.

Approved: 6 April 2020

Notes

References

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