Parathion Resistance and Esterase Activity in Codling Moth (Lepidoptera: Tortricidae) from North Carolina

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In 1989, we performed a sticky-card bioassay on adult males captured with pheromone traps that revealed an 8-fold resistance to parathion in a population of codling moth, Cydia pomonella (L.), from a commercial apple orchard in Wilkes County, NC. In 1991, parathion resistance in this population was confirmed with a sticky-card bioassay that exposed adult males to a diagnostic concentration of 120 ug (AI) parathion per gram adhesive (the estimated LC95 for adult males from susceptible populations). Reduced nonspecific esterase activity detected in adult males captured in the population resistant to parathion suggests that the mechanism of codling moth resistance to parathion may be a modified esterase with lower specificity for naphthyl acetate substrates. In 1990, the sticky-card bioassay did not detect azinphosmethyl resistance in adult males from a commercial apple orchard in Henderson County, NC, that experienced inadequate codling moth control with azinphosmethyl. In 1991, the sticky-card bioassay with a diagnostic concentration of 110 ug(AI) azinphosmethyl per gram adhesive (the estimated LC95 for adult males from susceptible populations) again failed to detect azinphosmethyl resistance in adult males from this codling moth population.

Document Type: Research Article

Publication date: June 1, 1993

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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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