Respostas na produtividade de plantas de soja mediadas por produtos biológicos com alvo em lagartas

Abstract

Caterpillars pose threats to soybean yield in Brazil. Viruses of the NPV group protect soybean plants against caterpillars. Nowadays, soybean farmers have adopted lower densities in order to reduce the pressure from leaf diseases. The consequences of spatial arrangements on the performance of NPV viruses in the field, mandatory parasites of Chrysodeixis includens (Lepidoptera: Noctuidae), are unclear and mainly in terms of responses in yield. The present work evaluated the effect of three doses of ChinSNPV (½ dose, standard dose and +½ dose), as well as the insecticide Chlorfluazuron, on the soybean plants yield as a function of two line spacing in soybean (0.5 and 0.7 m). The tests were conducted in a commercial soybean crop (cv. Syngenta 1163 RR®). Yield was higher in soybean kept 0.5 m between rows compared to 0.7 m. In the 0.5 m spacing, the highest yield was obtained in the +½ dose of ChinSNPV. The consequences of the change in the spatial arrangement of soybean in the field influencing yield, as well as the effect of biological products with a focus on caterpillars are discussed. The present work points out important ways to prioritize the efficiency of ChinSNPV against C. includens in soybean fields, including yield parameters.