Abstract
Context
Insects can be the cause of major ecological problems; they can transmit microbes and parasites that affect humans, and damage food crops, trees, and homes. The total economic cost of insect-related damage and disease is immeasurable. In traditional Iranian medicine (TIM), several medicinal plants have been identified as insecticides or insect repellents, but many of them are still unknown. Therefore, the aim of this study was to review the insecticidal or insect repellent activity of certain medicinal plants described in TIM.
Evidence Acquisition
Information about medicinal plants proposed as insecticides and insect repellents in the TIM was collected from the TIM literature, and searched in modern medical databases to find studies that confirmed their efficacy.
Results
Modern investigations have supported the claims of the insecticidal activity of several plants, including Allium sativum, Artemisia absinthium, Citrullus colocynthis, Laurus nobilis, Mentha pulegium, Myrtus communis, Nerium oleander, Ocimum basilicum, and Origanum majorana. However, in the cases of plants like Iris florentina and Malva sylvestris, there is not enough evidence in modern medicine to prove their effectiveness with regard to their insecticidal and insect repellent activities.
Conclusions
This study confirmed the Iranian traditional medicine claims of the insecticidal and insect repellent activity of certain plants. Further pharmacological and clinical studies are recommended to evaluate the overall efficacy and possible mechanisms underlying these herbs.
Keywords: Medicinal Plants, Insecticide, Insect Repellent, Traditional Medicine
1. Context
Insects have evolved into over one-million named species that occupy fundamental places in the world’s ecosystems. However, some insects carry parasites and microbes that affect humans through various diseases, including malaria, Chagas’ disease, Lyme disease, bubonic plague, and dengue fever. They can also affect animals and damage food crops (locusts), trees (gypsy moths), and homes (termites). The total economic cost of insect-caused damage and disease is immeasurable; therefore, some genetically altered insect-resistant crops and various insecticides have been developed to manage insects and insect-related damage and disease (1). However the use of a wide range of synthetic insecticides has been restricted recently, due to the high cost, harmful environmental effects, their non-biodegradable nature, and increasing insecticidal resistance. An efficient alternative source for insecticides is botanical, which can provide a simple and sustainable method of insect control (2).
Herbal medicines have been used for thousands of years as sources of bioactive and therapeutic substances with industrial and agricultural purposes (3, 4). Medicinal plants, and their derivatives or extracts, have been evaluated for different pest control strategies, assessing their toxic, lethal, repellent, antifeedant, fumigant, growth regulation, and deterrent effects on oviposition (5). Moreover, despite conventional insecticides, which are based on a single active ingredient, botanical insecticides containing mixtures of chemical compounds can affect both behavioral and physiological processes. Thus, the chance of pests developing resistance to such substances is very low. It seems that seeking bio-insecticides which are efficient, as well as being suitable and adaptive to ecological conditions, is essential in obtaining sufficient insect control (2).
Traditional Iranian medicine (TIM) is a reasonable scientific resource, which encompasses unique information in order to prevent and treat diseases (6, 7). For this study, the chapter entitled “Tard al Havam” in the Al Qanun Fil Tibb and the Alaghraz altabyh va almabahesololayee were completely reviewed, and all of the plants reported as possessing insecticidal activity in the Makhzan Al Advieh were studied (8-10).
In the present research, those plants which showed insecticidal and insect repellent activity in the TIM (8-10) were reviewed individually, and evidence of their possible efficacy in the literature was gathered.
2. Evidence Acquisition
Several medicinal plants have been perceived to have insecticidal and insect repellent properties in TIM. Therefore the present review was conducted to verify the insecticidal activity of some of the medicinal plants used frequently in TIM. The authors searched the TIM literature for “medicinal plants,” “insecticide,” and “insect repellent.” Additionally, information from important TIM books was collected and added to scientific reports derived from modern medical databases like PubMed, Scirus, ScienceDirect, Google Scholar, and Scopus. All of the retrieved articles were published between 1997 and 2014, and any in vitro, in vivo, or clinical evidence for efficacy and pharmacological mechanisms related to the insecticidal and insect repellent properties of plants were considered for inclusion. Those studies chosen for inclusion in this review revealed either the apparent beneficial function of these remedies or demonstrated their effectiveness indirectly on the mechanisms involved in insecticidal and insect repellent activity. Only published articles written in English were included in this review. The search terms included “insecticide” or “insect repellent” in the title and abstract, and the name of each mentioned plant in the whole text. The primary search results were evaluated by 2 independent investigators. Those articles in languages other than English, review studies, papers that evaluated a mixture of the plant with drugs other than herbs, case reports, and case control studies were excluded. The references of the included papers were also reviewed for additional, suitable studies. Finally, the included papers were reviewed for mention of the scientific names of the plant, their parts, and extracts, as well as the active components and species of insects.
3. Results
In this study, 20 herbal species were reported as insecticides or insect repellents in the Persian medical literature. Table 1 shows all of the data pertaining to the plant species, listed according to the scientific name, family, common name, traditional Iranian name, mode of application, and traditional use. Moreover, all of the details related to the pharmacological effects and mechanisms of action of the plants are reviewed in Table 2. Overall, these plants belong to 16 different families and, among them, Lamiaceae is represented by the greatest number of taxa (4), followed by Apiaceae (2).
Table 1. Anti-Insect Plants in Traditional Iranian Medicine.
Scientific Name | Family | Common Name | TIM Name | Mode of Application | Traditional Use |
---|---|---|---|---|---|
Allium sativum L. | Liliaceae | Garlic | Som | Decoction; Incense | Lousicide; Bee repellent |
Artemisia absinthium L. [XE “Artemisia absinthium L.”] | Asteraceae | Wormwood | Afsantin | Powder Poultice | Insect repellent Mosquito repellent |
Boswellia carterii Bir. [XE “Boswellia carterii Bir.”] | Burseraceae | Frankincense | Kondor | Decoction | Killing flies |
Citrullus colocynthis L. Schrad. | Cucurbitaceae | Colocynth | Hanzal | Decoction | Killing fleas Repelling fleas |
Dorema ammoinacum D.Don. | Apiaceae | Ammoniacum | Oshagh | Embrocating | Insect repellent, Used in insecticide mixtures |
Ferula asafoetida L. | Apiaceae | Asafetida | Anjodan | Incense Powder rubbed onto surface | Insect repellent Ant repellent |
Iris germanica L. | Iridaceae | Orris | Susan | Incense of root | Insect repellent |
Laurus nobilis L. | Lauraceae | Bay leaf | Ghaar | Incense Powder; Smoke of leaves and fruits | Insect repellent; Insecticide |
Malva sylvestris L. | Malvaceae | High mallow | Khobazi | Extract | Bee repellent |
Mentha pulegium L. | Lamiaceae | Pennyroyal | Fudanaj | Burning the plant; Incense Powder; Entire plant | Insecticide; Insect repellent; Clothes moth repellent |
Myrtus communis L. | Myrtaceae | Myrtle | Aas | Incense of leaves | Insect repellent (especially for mosquitoes) |
Nerium oleander L. | Apocynaceae | Oleander | Defli | Leaves | Flea repellent |
Ocimum basilicum L. | Lamiaceae | Basil | Shahasfaram | Fragrance | Insect repellent |
Origanum majorana L. | Lamiaceae | Marjoram | Marzanjush | Incense | Insect repellent |
Peganum harmala L. | Nitrariaceae | African rue | Harmal | Incense | Mosquito repellent |
Picea orientalis (L.) Peterm. | Pinaceae | Oriental spruce | Senobar | Wood ashes; Smoke of wood | Insect repellent; Mosquito repellent |
Platanus orientalis L. [XE “Platanus orientalis L.”] | Platanaceae | Oriental planetree | Dolb | Incense of leaves | Termite repellent |
Punica granatum L. | Lythraceae | Pomegranate | Romman | Incense Powdering surfaces | Insect repellent |
Ruta graveolens L. | Rutaceae | Common rue | Sodab | Decoction | Mosquito repellent |
Vitexagnus-castus L. | Lamiaceae | Chaste tree | Banjankosht | Incense Powdering surfaces | Insect repellent Insecticide |
Table 2. Efficiency of Action of Traditional Iranian Anti-Insect Plants.
Part/extract | Active Constituent | Efficiency | Ref |
---|---|---|---|
Allium sativum | |||
Garlic juice | - | Insecticidal against Delia radicum and Musca domestica | -(11) |
Tuber extract | - | Larvicidal against Anopheles stephensi and Culex quinquefasciatus | (12) |
Fruit extract | - | Acaricidal against Tetranychus cinnabarinus | (13) |
Cloves extract | - | Larvicidal against eggs, larvae, and adults of Callosobruchus maculates | (14) |
Essential oil of bulbs | - | Larvicidal against Culex pipiens | (15) |
Essential oil of bulbs | - | Fumigant toxicity against Camptomyia corticalis | (16) |
Essential oil of bulbs | - | Insecticidal and larvicidal against Lycoriella ingenua | (17) |
Essential oil of bulbs | - | Acaricidal on all stages of Boophilus annulatus | (18) |
Leaves and bulb | Lectins, (ASAI) (ASAII) | Insecticidal against Spodoptera littoralis | (19) |
Garlic lectins | ASAI and ASAII | Insecticidal against Acyrthosiphon pisum | (20) |
Artemisia absinthium [XE “Artemisia absinthium L.”] | |||
Essential oil | - | Repellency against Rhodnius prolixus | (44) |
Essential oil of leaves | Oxygenated monoterpenes | Repellency against Ixodes ricinus | (45) |
Leaf extract | - | Developmental inhibition of Sarcoptes scabieivar. suis | (46) |
Boswellia carterii [XE " Boswellia carterii ."] | |||
Essential oil of resin | - | Larvicidal against Lycoriella ingenua | (17) |
Essential oil of resin | - | Fumigant toxicity against Sitophilus oryzae | (47) |
Essential oil | - | Larvicidal against Aedes aegypti, Anopheles stephensi, and Culex quinquefasciatus | (48) |
Essential oil | - | Repellency against Aedes aegypti and Culex quinquefasciatus | (39) |
Citrullu scolocynthis | |||
Leaf extract | - | Larvicidal, ovicidal, and repellency against Culex quinquefasciatus | (21) |
Leaf extract | - | Larvicidal against Aedes aegypti and Culex quinquefasciatus | (22) |
Whole plant extract | Oleic acid and linoleic acid | Larvicidal against Aedes aegypti, Anopheles stephensi, and Culex quinquefasciatus | (23) |
Whole plant extract | - | Larvicidal against the Anopheles stephensi | (24) |
Fruit extract | - | Suppress overall egg laying of Bactrocera zonata | (25) |
Fruit extract | - | Insecticidal against adult stage of Lipaphis erysimi | (26) |
Fruit extract | - | Insecticidal against Tribolium castaneum | (27) |
Seed extract | - | Larvicidal against Culex quinquefasciatus, Anopheles stephensi, and Aedes aegypti | (28) |
Ferula asafetida | |||
Stem extract | - | Moderate antifeedant against Leptinotarsa decemlineata larvae | (49) |
Root extract | - | Toxicity against Anabasis aphylla | (50) |
Laurus nobilis | |||
Pure essential oil (purchased) | - | Aphidicidial activity against Brevicoryne brassicae | (29) |
Essential oil of leaves | - | Fumigant toxicity against all life stages of Tribolium confusum | (30) |
Essential oil of leaves | 1,8-cineole, linalool, and isovaleraldehyde | Repellency and toxicity against Rhyzopertha dominica and Tribolium castaneum | (31) |
Essential oil of leaves | - | Repellency against Tenebrio molitor larvae | (32) |
Essential oil of leaves | - | Insecticidal against adult Sitophilus zeamais | (33) |
Essential oil of leaves | - | Cytotoxicity toward Artemia salina | (34) |
Essential oil of branches | - | Repellency against Aedes aegypti | (35) |
Dust of leaves | - | Insecticidal against adult Sitophilus zeamais | (36) |
Mentha pulegium | |||
Essential oil (Purchased) | - | Acaricidal on Dermatophagoides farinae and D. pteronyssinus | (51) |
Essential oil (Purchased) | - | Fumigant toxicity against Camptomyia corticalis | (16) |
Essential oil of leaves | - | Fumigant and insecticidal against Musca domestica | (38) |
Essential oil of leaves | - | Larvicidal (fumigation) against Spodoptera littoralis | (52) |
Myrtus communis | |||
Essential oil of Leaves | - | Repellency against Culex quinquefasciatus | (39) |
Essential oil of Leaves | - | Larvicidal against Aedes aegypti, Anopheles stephensi, and Culex quinquefasciatus | (48) |
Essential oil of Leaves | Linalool | Insecticidal against adults of Ephestia kuehniella, Plodia interpunctella, and Acanthoscelides obtectus | (53) |
Nerium oleander | |||
Leaf extract | - | Larvicidal against the larvae and pupae of Anopheles stephensi | (54) |
Dust of flowers and its suspension | - | Insecticidal and repellency against adult Sitophilus zeamais | (36) |
Plant (leaves, roots, and stem) extract | - | Inhibitory effect on the development of Ceratovacuna lanigera | (55) |
Ocimum basilicum | |||
Essential oil (aerial parts) | - | Insecticidal against Acyrthosiphon pisum and Myzus persicae | (37) |
Essential oil of the plant | - | Insecticidal against Musca domestica | (38) |
Essential oil (purchased) | - | Repellency against Aedes aegypti, Anopheles stephensi, and Culex quinquefasciatus | (39) |
Essential oil of leaves | - | Repellency against the adult females of Culex pipiens | (40) |
Essential oil of leaves | Linalool | Antifeedant properties against Lymantria dispar | (41) |
Essential oil of leaves | Methyl eugenol, estragole, and linalool chemotypes | Volatile toxicity against Sitophilus oryzae, Rhyzopertha dominica, and Cryptolestes pusillus | (42) |
Stem extract | - | Larvicidal against Culex quinquefasciatus | (43) |
Origanum majorana | |||
Essential oil of leaves | Linalool | Fumigant toxicity against Ephestia kuehniella eggs and adults | (56) |
Essential oil (purchased) | - | Moderate fumigant toxicity against Camptomyia corticalis | (16) |
Aerial part extract | - | Insecticidal and larvicidal against Spodoptera littoralis | (52) |
Aerial part extract | - | Insecticidal against Musca domestica L. | (38) |
Aerial part extract | - | Repellency against Thrips tabaci | (57) |
Peganum harmala | |||
Seeds extract | - | Repellency against Bactrocera zonata | (25) |
- | Harmaline | Larvicidal against Plodia interpunctella | (58) |
Seeds extract | - | Insecticidal against Tribolium castaneum | (59) |
Punica granatum | |||
Fruit pericarp extract | - | Antifeedant against Sitophilus zeamais and Tribolium castaneum | (60) |
Leaves extract | - | Acaricidal against Tetranychus cinnabarinus | (13) |
Ruta graveolens | |||
Essential oil of aerial parts | - | Repellency and larvicidal against Aedes aegypti | (61) |
Vitexagnus-castus | |||
Seeds extract | - | Repellency against Ixodes ricinus and Rhipicephalus sanguineus | (62) |
Seeds extract | - | Repellency against Pediculus humanus capitis | (63) |
Based on the traditional resources, insecticidal or insect repellent plants have been used in various routes of application, including the crude plant, decoction, incense, powder, extract, embrocation, and local administration.
The TIM resources have divided the plants into two groups: I) plants which exhibit a general anti-insect effect, and II) plants that act against a specific insect, like bees, ants, mosquitoes, flies, moths, fleas, termites, and scorpions. According to the Iranian traditional texts, the plants had either insecticidal or insect repellent actions, whereas modern phytotherapy describes different mechanisms of action for these purposes. The biological mechanisms of these plants were searched in the literature using the following terms: repellency, insecticidal, larvicidal, acaricidal, ovicidal, adulticidal, oviposition, fumigant toxicity, arrestant, and antifeedant effects against insects.
Among the 20 studied plants, four of them showed greater activity against insects, and the most active plants are discussed below:
3.1. Allium sativum L.
A. sativum has demonstrated numerous insecticidal activities on a wide range of insect spices; for example, its juice had insecticidal activity against Delia radicum and Musca domestica (11). Garlic extract has shown larvicidal effects against Anopheles stephensi and Culex quinquefasciatus mosquitoes (12), and acaricidal activity against Tetranychus cinnabarinus (13). In addition, the extract of cloves has shown larvicidal activity against the eggs, larvae, and adults of Callosobruchus maculatus (14). Essential oil bulbs exhibited larvicidal activity against Culex pipiens (15), fumigant toxicity against Camptomyia corticalis (16), insecticidal and larvicidal potential against Lycoriella ingenue (17), and acaricidal properties against all stages of Boophilus annulatus (18). Moreover, the leaf (ASAI) and bulb (ASAII) agglutinins from A. sativum exhibited insecticidal activity against the cotton leafworm, Spodoptera littoralis (19). The garlic lectins, ASAI and ASAII, have also revealed insecticidal properties against Acyrthosiphon pisum (pea aphids) (20).
3.2. Citrullus colocynthis L. Schrad.
Citrullus colocynthis leaf extracts have shown larvicidal, ovicidal, and repellency properties against the Culex quinquefasciatus mosquito (21), and larvicidal effects against the early fourth instar larvae of Aedes aegypti and Culex quinquefasciatus (22). In addition, the extract of the whole plant has been examined in different studies, and showed larvicidal activity against the early fourth instar larvae of Anopheles stephensi (23, 24), Aedes aegypti, and Culex quinquefasciatus (23). Its fruit extracts have suppressed the overall egg laying ability of Bactrocera zonata (25), caused mortality against adult stages of Lipaphis erysimi (26), and had insecticidal activity against Tribolium custaneum (27). The seed extracts have revealed larvicidal properties against the 3rd instar larvae of Culex quinquefasciatus, Anopheles stephensi, and Aedes aegypti (28).
3.3. Laurus nobilis L.
The pure essential oil of Laurus nobilis has shown aphidicidial activity against Brevicoryne brassicae (29). Moreover, the essential oil of the leaves has shown fumigant toxicity against all of the life stages of Tribolium confusum (30); repellent potential against Tribolium custaneum, Rhyzopertha dominica (31), and Tenebrio molitor larvae (32); insecticidal effects against adult Sitophilus zeamais (33), Rhyzopertha dominica, and Tribolium castaneum (31); and cytotoxicity toward Artemia salina (34). Finally, the essential oil of the branches repelled Aedes aegypti (35), while the dust of the leaves caused insecticidal effects against Sitophilus zeamais adults (36).
3.4. Ocimum basilicum L.
The essential oil of the Ocimum basilicum plant has shown insecticidal activity against Acyrthosiphon pisum, Myzus persicae (37), and Musca domestica (38). It has also exhibited repellency against Aedes aegypti, Anopheles stephensi, Culex quinquefasciatus (39), and adult female Culex pipiens (40), as well as antifeedant properties against Lymantria dispar (41). In addition, volatile toxicity against Sitophilus oryzae, Rhyzopertha dominica, and Cryptolestes pusillus has been observed (42). Furthermore, the stem extract has revealed larvicidal activity against Culex quinquefasciatus (43).
4. Conclusions
In order to stop the spread of insect borne diseases and damage, save the environment, and improve the quality of public health, significant effort should be made to find new insect control strategies. The main approaches to insect control have consisted of using synthetic pesticides such as organochlorine and organophosphorus compounds, which have not been very successful, especially from an ecological point of view (2). Synthetic insecticides not only kill insects, but contaminate the food and cause air, water, and soil pollution. They are hazardous to the environment, man, and other creatures. To prevent the harmful effects of these pesticides, the above mentioned plant derived products can be used for insect control. Plant extracts having insecticidal properties should be made available to farmers, since scientific formulations of these plants are easily available in the area (55).
One beneficial example of herbal-based insecticides is “neem,” which is derived from the plant Azadirachta indica A. Juss. In addition to its wide range of effects, such as antifeedancy, repellency, growth inhibition, oviposition, insecticidal, and larvicidal activity, neem has shown no toxicity or allergies toward humans. It has only slight environmental impacts (over 90% pollution free), and no known chemical reactions of concern (64). Therefore, it would be a good model for developing plant-derived insecticides.
Several plants have been used in Traditional Iranian medicine as powerful insecticides, and for their insect repellent activities. Recent investigations support the claims of TIM about the efficacy of many of these plants, including Allium sativum, Apium graveolens, Artemisia absinthium, Carum carvi, Citrullus colocynthis, Laurus nobilis, Mentha pulegium, Myrtus communis, Nerium oleander, Ocimum basilicum, and Origanum majorana. For some of the herbal products used in TIM, such as Iris florentina, Dorema ammoinacum, Malva sylvestris, Picea orientalis, and Platanus orientalis, there are no (or not enough) studies to confirm their insecticidal activity. These studies suggest that indigenous knowledge and traditional practice can make valuable contributions to domestic food production in countries where the strict enforcement of pesticide regulations is impractical.
Overall, many medicinal plants have been used traditionally as insecticidal agents, and the biological actions of a wide range of anti-insect plants have been evaluated in recent investigations. Further studies evaluating the efficacy and safety of these herbs are recommended. In addition, understanding the pharmaceutical and pharmacological aspects of these plants is required in order to produce natural anti-insect agents.
Footnotes
Authors’ Contribution:Mina Cheraghi Niroumand suggested the topic, collected and analyzed data, and wrote the manuscript. Mohamad Hosein Farzaei contributed to the development of the protocol and writing the manuscript. Elahe Karimpour Razkenari collected the data. Mohammad Reza Shams-Ardekani and Gholamreza Amin contributed to the development of the protocol. Mahnaz Khanavi and Tahmineh Akbarzadeh suggested the topic of the article and contributed to the development of the protocol.
Funding/Support:This research has been supported by a Tehran University of Medical Sciences grant.
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