Associação de vírus entomopatogênicos e inseticida sintético no manejo de Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae)

Abstract

The objective of this work was to evaluate the association of biological and synthetic insecticides on caterpillars of Spodoptera frugiperda, commonly known as fall armyworm, an important pest species present in the brazilian agricultural system. The entomopathogenic viruses Autographa californica multiple nucleopolyhedrovirus (AcMNPV) (Lepigen®) and Spodoptera frugiperda multiple nucleopolyhedrovirus (SfMNPV) (Cartugen®) and the insecticide Klorpan® 480 EC (Chlorpyrifos) were used, isolated or in a mixture, in full and half doses, in addition to the control treatment (distilled water). The experiment was carried out in the laboratory, in a completely randomized design, with 19 treatments, each one containing 6 repetitions with 5 caterpillars. The total mortality and efficiency on the caterpillars were evaluated every 24 hours. It was found that Klorpan® alone or in mixture with biopesticides, regardless of the dose tested, provided greater mortality and efficiency, being also observed for the treatment with Lepigen® in half dose. All treatments were efficient, both in half and full doses, with emphasis on the associations with synthetic insecticide that provided higher mortality of S. frugiperda.