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Comparative Studies on Four Strains of Typhtodromus occidentatis. II. Laboratory Toxicity of Ten Compounds Common to Apple Pest Control1

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Four strains of Typhlodromus occidentalis Nesbitt from different geographical areas were exposed to 10 compounds which arc common to the control of apple pests in the western United States. Predator strains from Washington and Utah demonstrated resistance to azinphosmethyl and Gardona® (2-chloro-1-(2,4,5-trichlorophenyl)vinyl dimethyl phosphate) when compared with 2 susceptible strains from California. The Washington strain of T. occidentalis when contrasted with strains from Utah and California, exhibited tolerance differences for 4 compounds including carbaryl, clicofol, oxythioquinox and Omite® (2- (p-ten- butylphenoxy) cyclohexyl 2-propynyl sulfite). Predaccous mites from Oak Glen, near Yucaipa, California, were least susceptible to dinocap treatments. Carbaryl applications, when compared with reports of field evaluations in the published literature, were less toxic in our laboratory test than expected. Except when applied at extremely high dosages, parathion was uniformly nontoxic to all predator strains. Toxicity differences among- strains appeared to be due to selection arising from previous chemical treatments and to have resulted in cross tolerant, tolerant, and resistant strains of T. occidelltalis.

Document Type: Research Article

Publication date: October 1, 1970

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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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