Two days after moulting to the 3rd instar, larvae ofChrysopa rufilabrisBurmeister were exposed to technical and commercial formulations of 5 pesticides. Technical pesticides in decreasing order of toxicity toC. rufilabrislarvae were: azinphosmethyl, carbaryl, ethion, carbophenothion, and chlorobenzilate.Residues of commercial azinphosmethyl 2 EC and carbaryl 50% WP had high and medium toxicity, respectively. Ethion + oil, carbophenothion 2 EC, and ethion 4 EC had low toxicity, while chlorobenzilate 25% EC had 0 toxicity. Azinphosmethyl and carbaryl residues were toxic up to 22 days postapplication. Ethion + oil, carbophenothion, and ethion showed 0 toxicity after 6 days.