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 a pple 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 developmen t 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 testin g indicated that 10 g a.i./ha of lambda-cyhalothrin applied at pink wa s very effective against the tarnished plant bug.