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Differential Susceptibilities of Green Peach Aphid (Homoptera: Aphididae) and Two Endoparasitoids (Hymenoptera: Encyrtidae and Braconidae) to Pesticides

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Mortality of green peach aphid, Myzus persicae Sulzer and two of its hymenopteran parasitoids, Aphelinus semiflavus Howard and Diaeretie/la 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, bi£enthrin, 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 bi£enthrin and one concentration of endosulfan produced significantly lower mortality in D. rapaethan 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.

Document Type: Research Article

Publication date: June 1, 1991

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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