We assessed the toxicity of four pesticides on adult Coleomegilla maculata lengi Timberlake. Their LC 50 was estimated by applying the pesticides on the ventral side of adults by micropipette. Malathion and cypermethrin had the highest toxicity followed, in decreasing order, by carbaryl and benomyl. Benomyl, however, caused very low mortality. During 72 h, mortality occurred differentially depending on the pesticides used, Their effects on the predation efficiency (sublethal effect) of adult coccinellids also was evaluated. Only the fungicide benomyl applied at field rate significantly reduced the number of aphids consumed 24 h after treatments