Abstract
Foraging aphid parasitoids,Diaeretiella rapae M'Intosh, were exposed to sublethal doses of the insecticides pirimicarb, permethrin and malathion on brusslls sprouts plants. Observations on wasp distribution over time revealed that wasps spent less time on sprayed plants, relative to controls and, while on these plants, tended to concentrate activity on unsprayed surfaces. For permethrin and malathion, pesticide residues reversed the stereotypic upward foraging pattern of the wasp. Negative consequences of sublethal pesticide doses for parasitoid foraging efficiency are discussed.
Résumé
Les parasitoïdes aphidiphages,Diaeretiella rapae M'Intosh, ont été exposés à des doses subléthales des insecticides: pirimicarb, permethrin et malathion sur des plants de Choux de Bruxelles. Les observations sur la répartition des hyménoptères en fonction du temps révèlent qu'ils passent moins de temps sur les plantes traitées que sur les témoins et que sur les premières, ils tendent à concentrer leur activité sur les surfaces non traitées. Pour la permetrine et le malathion, les résidus des produits inversent le modèle stéréotypé de recherche de la nourriture chez l'hyménoptère. Les conséquences négatives des doses subléthales de pesticides pour l'efficacité de recherche du parasitoïde sont discutées.
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De Jiu, G., Waage, J.K. The effect of insecticides on the distribution of foracing parasitoids,Diaeretiella rapae [Hym.: Braconidae] on plants. Entomophaga 35, 49–56 (1990). https://doi.org/10.1007/BF02374300
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DOI: https://doi.org/10.1007/BF02374300