RESUMO-O surgimento de tecnologias para o controle de pragas na cultura do milho deve ser analisado periodicamente, para a adoção nas regiões produtoras desse cereal. O objetivo deste trabalho foi avaliar a flutuação populacional de Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), Diatraea saccharalis (Fabricius) (Lepidoptera: Pyralidae) e do predador Doru luteipes (Scudder) (Dermaptera: Forficulidae) em cultivo de milho convencional e Bt. O ensaio foi conduzido na safrinha, em Rio Verde, GO, com delineamento experimental de blocos casualizados, com 24 repetições. Foram empregados os híbridos P 3041 e P 3041YG, com população de 50.000 plantas.ha-1. Quantificaram-se o número de insetos e os danos provocados pelas lagartas nas folhas, colmo e pendão, quantificação e presença de internódios com galerias, altura de plantas e da inserção de espiga, massa de grãos por espiga e rendimento de grãos. O híbrido de milho P 3041YG sofreu menor ataque de S. frugiperda e apresentou maior massa de grãos por espiga e maior rendimento de grãos em relação ao híbrido convencional P 3041. Palavras-chave: Zea mays, controle biológico, inimigo natural, safrinha, transgênico. POPULATION DYNAMICS OF Spodoptera frugiperda (J. E. SMITH), Diatraea saccharalis (FABRICIUS) AND Doru luteipes (SCUDDER) IN CONVENTIONAL AND Bt TRANSGENIC MAIZE ABSTRACT-New technologies to pests control in maize should be periodically reviewed for adoption in the cereal producing regions. This study aimed to evaluate the population dynamics of Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), Diatraea saccharalis (Fabricius) (Lepidoptera: Pyralidae) and the predator Doru luteipes (Scudder) (Dermaptera: Forficulidae) in the development of conventional and Bt transgenic maize. The trial was set up in the off-season cultivation in Rio Verde, GO, Brazil. The experimental design was the randomized blocks with 24 repetitions. The hybrids P 3041 and P 3041YG were used, with a population of 50,000 plants.ha-1. It were evaluated the number of insects and the damages caused by the caterpillars on the leaves, stems and tassel, quantification and presence of internodes with galleries, plant height and insertion of ear, grain mass per ear and grain yield. The results allowed concluding that the hybrid P 3041YG showed lower damage of S. frugiperda and presented higher grain mass of ear and grain yield compared to the P 3041conventional hybrid.
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