AVALIAÇÃO DE INSETICIDA EM DIFERENTES POPULAÇÕES DE PERCEVEJO MARROM NA CULTURA DA SOJA

Abstract

The brown stink bug (Euschistus heros) is a key pest for the soybean crop and can cause damages to grains and seeds. The objective of this work was to evaluate dosages of the chemical compounds TIAMETOXAM and LAMBDA-CIALOTRINA on different populations. The experiment was conducted at the “Instituto Federal Goiano” in the Entomology Laboratory. The insects used in the experiment came from field capture in two regions of Goiás State in the municipalities of Serranópolis and Iporá. The compounds used were TIAMETOXAM at 141 g of ai.L-1 and LAMBDA-CIALOTRIN at 106 g of ai.L-1. The experimental design was completely randomized with five treatments: 0, 100, 200, 250, and 300 mL per hectare, and 5 replications. (Using a pipette, 2 microliters of each treatment were applied in the chest of two adult Euchistus heros specimens, by repetition). The treatments were evaluated at 1, 2, 3, 6, 12, and 24 hours after the application of the products in the insects. The different populations had different susceptibility behaviors, in which the population of the municipality of Iporá was more susceptible to the application of TIAMETOXAM at 141 g/L and LAMBDA-CIALOTRINE at 106 g/L compared with Serranópolis.