Mortality of Twospotted Spider Mite 1 Predators Caused by the Systemic Insecticide, Carhofuran 2

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Abstract
Carbofuran, a systemic insecticide, was studied for its effect on two predators of the twospotted spider mite, Tetranychus urticae (Koch); Amblyseius fallacis (Garman) and Orius tristicolor (White). Both predator species showed high mortality when caged on systemically-treated excised lima bean seedlings. The presence of prey had little effect on mortality of the 2 predator species indicating that ingestion of poisoned plant sap was a likely mode of poisoning. These results were substantiated on strawberry plants grown in carbofuran-treated soil in greenhouse tests. Side-dressed field applications of carbofuran 10 G at 1.1 and 4.5 kg AI/ha to strawberry plants significantly (P = .05) reduced populations of Orius and Nabis spp. nymphs one week after treatment. T. urticae , Amblyseius spp., and spider populations were not significantly changed. Field applications of carbofuran 4 FC at 1.1 and 4.5 kg AI/ha to the crowns of raspberry plants, which provided systemic and contact action, significantly reduced populations of Orius spp. adults and nymphs, and Nabis spp. nymphs. Spider populations were not significantly reduced.

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