EFICÁCIA DE INSETICIDAS NO CONTROLE DE BEMISIA TABACI EM FEIJOEIRO COMUM

Abstract

The common bean is a legume of great socioeconomic relevance in Brazil and worldwide. Several diseases and pests affect the bean plant causing great economic losses. The insect-pest whitefly stands out for being a vector of golden mosaic, the main disease of viral origin in the crop. The objective of this work was to evaluate the efficiency of chemical and biological insecticides in the control of B. tabaci in common bean. The experiment was conducted in randomized blocks with four repetitions on Santa Fé farm, located in Estrela do Sul, MG. The treatments used were pyriproxyphem, acetamiprid, pyriproxyphem + acetamiprid, dinotefuram, pyriproxyphem + dinotefuram, Beauveria bassiana and Isaria fumosorosea. The first application of the treatments was made at the V3 vegetative stage at the beginning of infestation and the second ten days after the first. Evaluations were made at 3 and 7 days after the first application, and at 3, 7, 14 and 21 days after the second application. The number of eggs, nymphs, adults, incidence of golden mosaic and yield were evaluated. The insecticides acetamiprid + pyriproxyfen and dinotefuram + pyriproxyfen showed good efficiency in controlling eggs, nymphs and adults of B. tabaci in common bean until 14 days after the second application. The fungi B. bassiana and I. fumosofera obtained satisfactory efficiency in egg, nymph and adult stages of B. tabaci until 14 days after the second application, being an important alternative in the management of whitefly in common bean culture. Despite the presence of B. tabaci in the field, the incidence of golden mosaic was not observed in the evaluated plots.