Residual toxicity of lambda-cyhalothrin on apple foliage to Amblyseius fallacis and the tarnished plant bug, Lygus lineolaris

The residual toxicity of lambda-cyhalothrin on leaves from a treated apple orchard to a mite predator, Amblyseius fallacis (Garman), in the laboratory, declined to one-third of its original level within 3 weeks. The absence of A. fallacis on apple trees during the pink bud stage coupled with the results of this study pave the way for the development of integrated pest management strategies where key pre-bloom pests, such as the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), may be controlled with lambda-cyhalothrin with little if any toxic effects to the predator later in the season. Two years of field testing indicated that 10 g a.i./ha of lambda-cyhalothrin applied at pink was very effective against the tarnished plant bug.