Monitoring Susceptibility to Azinphosmethyl in Field Populations of the Codling Moth (Lepidoptera: Tortricidae) with Pheromone Traps

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A procedure was developed to screen field populations of Cydia pomonella (L.) directly for resistance to azinphosmethyl or other toxicants. Male moths were collected in the field with pheromone traps and assayed with azinphosmethyl by topical application to the dorsal thorax directly on the adhesive-coated trap surface. The first flight had a steeper concentration-mortality regression than the second flight, indicating an increase in variability of the toxicological response over the season. The LC50 of moths trapped during the spring flight was somewhat higher (0.22 µg/moth) than during the summer (0.08–0.16 µg). Assays of laboratory-reared moths from the same location kept in plastic cages or on sticky trap surfaces to simulate the test procedure with field-collected moths yielded LC50's in the same range (0.10–0.14 µg/moth). The longevity of moths and their toxicological response was not affected by the polybutene adhesive provided it was applied as a thin uniform film to the trap surface. Susceptibility to azinphosmethyl increased considerably with age in both sexes and was not correlated with loss in body weight. Female moths were slightly more susceptible when azinphosmethyl was applied to the thoracic venter instead of the dorsum. Males were equally susceptible to either application.

Document Type: Research Article

Publication date: June 1, 1985

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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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