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Naturally occurring bioactive compounds from four repellent essential oils against Bemisia tabaci whiteflies
Author(s) -
Deletre Emilie,
Chandre Fabrice,
Barkman Barbara,
Menut Chantal,
Martin Thibaud
Publication year - 2016
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.3987
Subject(s) - cymbopogon citratus , cuminum , cinnamomum zeylanicum , geraniol , biology , lauraceae , toxicology , essential oil , citronellol , biopesticide , deet , netting , olfactometer , botany , mentha arvensis , horticulture , agronomy , pesticide , ecology , political science , law , host (biology)
BACKGROUND In tropical countries, netting is an effective sustainable tool for protecting horticultural crops against Lepidoptera, although not against small pests such as Bemisia tabaci , while smaller mesh netting can be used in temperate regions. A solution is to combine a net with a repellent. Previously we identified repellent essential oils: lemongrass ( Cymbopogon citratus ), cinnamon ( Cinnamomum zeylanicum ), cumin ( Cuminum cyminum ) and citronella ( Cymbopogon winternarius ). The present study was designed to identify the active compounds of these essential oils, characterise their biological activity and examine their potential for coating nets. We investigated the efficiency and toxicity of nets dipped in different solutions. We then studied the repellent effect with an olfactometer and the irritant effect by videotracking. RESULTS Geraniol and citronellol were the most promising net coatings owing to their repellent effect. The repellency, irritancy or toxicity varied with the product and concentration, and these features were independent, indicating that the repellent and the irritant/toxic mechanisms were not the same. The combined effects of these different compounds account for the bioactivity of the mixture, suggesting interactions between the compounds. CONCLUSION This new sustainable strategy for protecting vegetable crops against whiteflies is discussed, in addition to the use of companion plants that could produce such bioactive compounds. © 2015 Society of Chemical Industry