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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