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Differential susceptibilities of green peach aphid (Homoptera: Aphididae) and two endoparasitoids (Hymenoptera: Encyrtidae and Braconidae) to pesticides



Differential susceptibilities of green peach aphid (Homoptera: Aphididae) and two endoparasitoids (Hymenoptera: Encyrtidae and Braconidae) to pesticides



Journal of Economic Entomology 84(3): 844-850



Mortality of green peach aphid, Myzus persicae Sulzer and two of its hymenopteran parasitoids, Aphelinus semiflavus Howard and Diaeretiella rapae (McIntosh) was evaluated after treatment with four pesticides commonly applied in greenhouses. Mortality of adult green peach aphid, D. rapae, and A. semiflavus was evaluated after exposure to five different concentrations of abamectin, bifenthrin, endosulfan, and acephate in a treated-vial bioassay. Concentrations included recommended label rates and multiple serial dilutions. Ranges in sensitivity of adults of each species were observed with the four compounds tested. Two concentrations of bifenthrin and one concentration of endosulfan produced significantly lower mortality in D. rapae than in green peach aphid. Immature stages of D. rapae and A. semiflavus were also evaluated for mortality by dipping leaf tissues containing mummified aphids into concentrations of either abamectin or endosulfan recommended on the label. The mummy stage of these parasitoids is resistant to abamectin and endosulfan at concentrations that are lethal to green peach aphid. This result suggests that these materials can be used selectively to integrate chemical and biological controls.

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Accession: 002072842

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DOI: 10.1093/jee/84.3.844



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