Responsesof tufted apple bud moth, Platynota idaeusalis (Walker), neonates in direct spray and leaf residue bioassays with the organophosphates azinphosmethyl, chlorpyrifos, microencapsulated methyl parathion, phosmet, and phosalone; the carbamates methomyl and thiodicarb; and the pyrethroid fenvalerate were measured for a laboratory strain and for populations collected from orchards at the Pennsylvania State University Fruit Research Laboratory in Adams County, Pa. The relative ranking of pesticide toxicity for the laboratory strain was similar in both bioassays: pyrethroid > carbamates > organophosphates. However, certain organophosphates such as chlorpyrifos and microencapsulated methyl parathion were much more effective in the leaf residue than direct spray tests. Highest resistance levels (field LC50,/laboratory LC50) were found for the organophosphates in both tests (3- to 17-fold), especially with azinphosmethyl (17-fold). Carbamates and pyrethroids had low resistance levels (1- to 4-fold). Resistance levels to azinphosmethyl were high (17- to 24-fold) within commercial and experimental apple orchards scattered throughout Adams County.
Document Type: Research Article
Publication date: August 1, 1989
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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.