Toxicity of Carbaryl and Six Organophosphorus Insecticides to Amblyseius fallacis and Typhlodromus pyri1 from New York Apple Orchards 2 , 3

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Abstract
In commercial apple orchards of New York, 2 species of predatory mites of the family Phytoseiidae are commonly found where 6–8 applications of organophosphorus and other orchard pesticides are applied/season. Results from laboratory bioassays indicate that both species, Amblyseius fallacis (Garman) and Typhlodromus pyri Scheuten, are tolerant to azinphosmethyl. In addition, A. fallacis is extremely susceptible to carbaryl and phosalone whereas T. pyri is highly tolerant to both materials. A. fallacis is also highly tolerant to Imidan®, [O,O-dimethyl phosphorodithioate S-ester with N-(mercaptomethyl) phthalimide], extremely susceptible to demeton and dimethoate, but moderately tolerant to parathion. T. pyri tolerance to Imidan is not appreciable.

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