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Monitoring of Insecticide Resistance in Phyllonorycter mespilella (Lepidoptera: Gracillariidae) in Four Western States

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A 4-state regional survey was conducted to assay for insecticide susceptibility in Phyllonorycter mespilella (Hübner)to azinphosmethyl,oxamyl, and esfenvalerate. Levels of insecticide susceptibility were determined using a topical bioassay on male moths collected in the field with pheromone traps in California, Oregon, Utah, and Washington. Of the populations of adult male P. mespilella tested, all but the population of Saint Cloud, WA, were resistant to azinphosmethyl. All populations tested were susceptible to oxamyl. Approximately 15% of the individuals within the Saxton population in California were resistant to esfenvalerate. An egg bioassay indicated that azinphosmethyl did not provide effective control at commercial application rates. In larval bioassays, oxamyl at 0.30 g (AI)/Iiter was shown to control 99% of the Saxton population, whereas no mortality was detected with azinphosmethyl or fenvalerate at commercial application rates.

Document Type: Research Article

Publication date: April 1, 1997

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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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