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Feeding Behavior of Mexican Bean Beetle on Leaf Extracts of Resistant and Susceptible Soybean Genotypes

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In feeding bioassays, female Epilachna varivestis Mulsant demonstrated a distinct preference for leaves of the susceptible soybean variety 'Forrest', over those of the resistant PI 229358, but males did not. Females, 14 days old, caused significantly (P/ ≤0.05) more defoliation than 3- or 35-day-old females. In bioassays of Forrest leaf extracts applied to filter paper discs, females fed significantly (P ≤0.01) more on discs treated with water leaf extract (WLE) than on discs treated with either CHCl3:MeOH extracts or sucrose. Feeding was greater on discs treated with WLE collected during and 20 days before soybean bloom than on discs treated with WLE collected 10 days after bloom. In 2 choice tests, females also fed significantly (P ≤0.01)more on discs treated with prebloom Forrest WLE than on discs treated with prebloom PI 229358 WLE.

Document Type: Research Article

Publication date: June 1, 1979

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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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