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A lagarta-do-cartucho do milho (Spodoptera frugiperda (J. E. Smith)) tem sido controlada com inseticidas sintéticos. Uma das caracteristicas do nim (Azadirachta indica A. Juss) é sua atividade inseticida contra pragas, como sucedâneo aos sintéticos. O objetivo deste trabalho foi avaliar a atividade inseticida do extrato aquoso das folhas do nim sobre a lagarta-do-cartucho do milho, em laboratório. Bioensaios com diferentes concentrações de extrato em dieta artificial, tendo o inseticida chlorpyrifos como testemunha, revelaram, 15 dias após infestação com larvas, eficiência equivalente entre as concen- trações 3,60 a 10,00 mg mL-1. A análise de Probit mostrou CL50 = 2,67 mg mL-1; o extrato aquoso das folhas de nim apresenta, portanto, efeito inseticida sobre a lagarta-do-cartucho do milho. The fall armyworm (Spodoptera frugiperda (J. E. Smith)) has been controlled with synthetic insecticides bringing risk to the environment. Neem (Azadirachta indica A. Juss) is reported to be a natural alternative to synthetic insecticides against many insect species. The objective of this work was to evaluate the activity of neem leaves aqueous extract on fall armyworm, in laboratory. Bioassays carried out using artificial feed with various extract concentrations, and chlorpyrifos as control, indicated, 15 days after larvae infestation, similar efficiency in concentrations from 3.60 to 10.00 mg mL-1. Probit analysis showed LC50 = 2.67 mg mL-1. Hence, aqueous extract from neem leaves are active against fall armyworm

Atividade de extrato aquoso de folhas de nim (Azadirachta indica) sobre Spodoptera frugiperda