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Insecticide Toxicity to the Soybean Looper and the Velvetbean Caterpillar (Lepidoptera: Noctuidae) as Influenced by Feeding on Resistant Soybean (PI 227687) Leaves and Coumestrol

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Permethrin, fenvalerate, acephate, methyl parathion, and methomyl were tested on larvae of the velvetbean caterpillar, Anticarsia gemmatalis (Hübner), and the soybean looper, Pseudoplusia includens (Walker), fed on a susceptible ('Bragg') or a resistant (PI 227687) soybean cultivar. At LD50, susceptibility of A. gemmatalis larvae to fenvalerate and acephate was significantly enhanced by feeding on the resistant cultivar (1.5 and 1.6 times, respectively). P. includens reared on resistant leaves were also significantly more susceptible to acephate (2 times) than when they were reared on susceptible leaves. The toxicity of the other insecticides examined for each insect was not affected. Incorporation of coumestrol, an isoflavonoid associated with PI 227687 resistance, into a modified artificial diet resulted in significant reductions in weight gain for P. includens larvae. Feeding on a diet amended with coumestrol significantly enhanced the toxicity of fenvalerate (1.5 times) while reducing toxicity of methomyl (2 times) to larvae of P. includens.

Document Type: Research Article

Publication date: October 1, 1988

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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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