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A lagarta-do-cartucho (Spodoptera frugiperda) é uma praga importante do milho (Zea mays L.), sendo muitas vezes controlada com inseticidas. Nos municípios de Cruz Alta, Fortaleza dos Valos e Pejuçara - RS, há relatos de ineficiência de inseticidas. Neste sentido, foram conduzidos três experimentos a campo envolvendo, respectivamente, época, modo e volume de aplicação de inseticidas. As avaliações, baseadas no número de lagartas vivas e mortas por planta, foram realizadas aos quatro e oito dias após a aplicação dos inseticidas. A eficiência dos inseticidas variou em função da época, modo de aplicação e do volume de calda aplicado, sendo menor nas aplicações tardias (danos severos), em área total e com menor volume de calda (150l/ha). Entretanto, maior eficiência foi observada nas aplicações logo que surgiam os primeiros sintomas de ataque, apenas sobre a fileira das plantas, dirigindo-se o jato para o interior do cartucho e com maior volume de calda (300l/ha). O inseticida lufenurom (12,5g i.a./ha), usado nos três experimentos, propiciou maior nível de controle. The fall armyworm (Spodoptera frugiperda) is an important insect pest of maize, being frequently controlled through the use of insecticides. In the counties of Cruz Alta, Fortaleza dos Valos and Pejuçara, Rio Grande do Sul State, there have been reports of low insecticide efficiency. Three field experiments were conducted including different application methods, timing and volume of insecticides. The evaluation was based on number of live and dead larvae per plant at four and eight days after treatment. The results showed that the efficiency of insecticides varied with the application method and timing, as well as with the volume of suspension applied. Lower insecticide efficacy was observed for late application (when damage was severe), for the method of application on total surface area and using smaller volume of suspension (150l/ha). Increased insecticide control was observed when they were applied at the beggining of insect attack and directing the spray toward the inside of the plant whorl and with higher suspension volume (300l/ha). The insecticide lufenuron (12.5g a. i./ha), in three field experiments, provided high insect control

Fatores que afetam a eficiência de inseticidas sobre Spodoptera frugiperda Smith em milho