Eficiência de inseticidas no controle do percevejo marrom, Euschistus heros (Fabricius) (Hemiptera: Pentatomidae), na cultura da soja

Abstract

The culture of soya is having featured in Brazil in recent decades. But the culture still have phytosanitary problems that can compromise the productive. The main problem that happens in culture of soya is the infection of pests when don't have control required. The species Euschistus heros can be considered a major pest of soya. In order to ensure the efficiency of insecticides to control of the bed bugs Euschistus heros were tested chemicals, Imidacloprid + Bifenthrin (200 ml / ha, 300 ml / ha, 400 ml / h and 500 mL / ha) + Imidacloprid Betacifultrina (750 ml / ha) and thiamethoxam + Lambda-cyhalothrin (200 ml / ha) applied in spray on soya. The experiment was conducted in the field of soya cultivation Potency BRASMAX during the 2012/2013 harvest. The experimental design was randomized blocks with 7 treatments in 4 replicates. The plots consisted of 14 soya rows spaced 45 cm by 10 m long (63 m2). Chemical treatments were applied to soya only once, using a constant-pressure sprayer (CO2). In this experiment was made a pre-count of the total number of bed bugs three days before spraying, indicating that the number of bugs was slightly above the threshold level. Were carried new count at 3, 7, 10 and 14 days after the chemical treatments where showed that all products were satisfactory in control of Euschistus heros.