Table 4.

Data quality assessment by the data providers concerning a potential bias in insect pests and pathogens, and steps taken thereafter (contacting of new experts and completing the database).

Country	Initial data quality assessment			After initial assessment			Final assessment
	Bias in insects and other pests	Bias in pathogens	Potential for more data from new experts	Contacting of new experts	Response of new experts	New entries/updates/gap filling	Overall bias
AT	2	2	No	n.a.	n.a.	Yes	1
BA	1	1	No	n.a.	n.a.	No	1
BE-WAL	2	2	Yes	Yes	No	Yes	2
BG	1	1	No	n.a.	n.a.	Yes	1
CH	1	1	No	n.a.	n.a.	Yes	1
CZ	1	1	Yes	No	n.a.	Yes	1
DE	NA	NA	Yes	Yes	Yes	Yes	2
DK	3	3	Yes	Yes	Yes	Yes	1
EE	2	2	Yes	Yes	Yes	Yes	1
ES	1	1	No	n.a.	n.a.	Yes	1
FI	NA	NA	No	n.a.	n.a.	Yes	1
FR	2	2	Yes	Yes	Yes	Yes	2
GB	2	2	Yes	Yes	No	No	1
GR	1	1	No	n.a.	n.a.	Yes	1
HU	1	1	No	n.a.	n.a.	No	1
IE	1	1	Yes	No	n.a.	Yes	1
IT	NA	NA	No	n.a.	n.a.	Yes	1
LT	2	2	No	n.a.	n.a.	Yes	2
NO	1	1	No	n.a.	n.a.	Yes	1
PL	NA	NA	No	n.a.	n.a.	Yes	1
PT	2	2	Yes	Yes	No	Yes	2
RO	2	3	Yes	Yes	Yes	Yes	1
RS	1	1	No	n.a.	n.a.	Yes	1
SE	3	3	Yes	Yes	Yes	Yes	1
SI	1	1	No	n.a.	n.a.	Yes	1
SK	NA	NA	Yes	No	n.a.	No	2
UA	2	2	Yes	Yes	Yes	Yes	2

Every data provider agreed to check for new records and fill NAs in existing entries. The bias is evaluated according to the following scheme: 1 – ‘The data well reflect the situation of the pest/pathogen impact. There is no bias due to prioritization of certain tree species and/or lack of experts’; 2 – ‘The data on pest/pathogen impact have some bias. The bias due to prioritization of certain tree species and/or lack of experts is, however, minor’; 3 – ‘The data on pest/pathogen impact have major bias. Due to prioritization of certain tree species and/or lack of experts the data does not reflect the complete situation in the country and thus should not be used in a cross-country analysis’;

n.a. – not applicable.