The effect of some insecticides on larvae of two populations of Chrysoperla externa (Hagen, 1861) (Neuroptera: Chrysopidae) from Bento Gonçalves and Vacaria, RS were evaluated under laboratory conditions (25±2°C, RH of 70±10% and 12 hours-photophase). The compounds were used at commercial or research concentrations used to control oriental fruit moth, leaf roller and fruit fly on apple orchards. The products and rates (g ou mL of formulated product/100L of water) evaluated were: phosmet (Imidan 500 PM - 200), methoxyfenozide (Intrepid 240 SC - 60), tebufenozide (Mimic 240 SC - 60), emamectin benzoate (Proclain 5 SG - 15), spinosad (Tracer 480 SC - 20), etofenprox (Trebon 100 SC - 150) and chlorpyrifos (Lorsban 480 BR - 150), using water as control. Spraying of insecticides was on first-instar larvae using the Potter tower. The survival rate and duration, larval and pupal development time and, fecundity and fertility of survivor adults were evaluated. The toxic effect of each product was estimated by the total effect (E) according to the IOBC recommendations. Emamectin benzoate was classified as harmless (class 1) to first-instar larvae of C. externa from Bento Gonçalves. Methoxyfenozide, etofenprox, tebufenozide, spinosad and phosmet were classified as slightly harmful (class 2), and chlorpyrifos was classified as harmful (class 4). Emamectin benzoate was harmless; fosmet was moderately harmful (class 3), and chlorpyrifos was harmful to the C. externa from Vacaria.
pesticides; green lacewing; toxic effects; integrated pest management; biological control
