Carbofuran, a systemic insecticide, was studied for its effect on two predators of the twospotted spider mite,Tetranychus urticae(Koch);Amblyseius fallacis(Garman) andOrius 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 ofOriusandNabisspp. nymphs one week after treatment.T. urticae,Amblyseiusspp., 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 ofOriusspp. adults and nymphs, andNabisspp. nymphs. Spider populations were not significantly reduced.