The effect of insecticides on the distribution of foracing parasitoids,Diaeretiella rapae [Hym.: Braconidae] on plants |
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Authors: | Gu De Jiu J. K. Waage |
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Affiliation: | (1) South China Agricultural University, Guangzhou, Peoples Republic of China;(2) CAB International Institute of Biological Control, Silwood Park, Buckhurst Lane, SL5 TA Ascot, Berks, UK |
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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. |
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Keywords: | Pesticide parasitoid foraging behaviour Diaretiella rapae sublethal effects |
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