CONTROLE QUÍMICO DE PERCEVEJOS EM DIFERENTES ESTÁDIOS DE DESENVOLVIMENTO DA CULTURA DA SOJA

Abstract

ABSTRACT

The Stinkbugs are pests of great importance in the soybean crop, because they damage the quality of grains and seeds, besides causing physiological changes in the plant, being the chemical control the main measure used. The objective of this work was to evaluate the effect of three products with different combinations of pyrethroids with neonicotinoids in the control of bedbugs at different stages of soybean plant development. The experiment was carried out in the Advanced Experimental Field BASF, in the city of Uberlândia, MG. The bed bug infestation occurred naturally. The experimental design was in randomized blocks, in a 4 x 6 factorial scheme (4 treatments in 6 application moments) with 4 replications. The products used for the control of bedbugs were: 1 - witness (without application); 2-thiametoxan + λ-cyhalothrin; 3-acetamiprid + α-cypermethrin; and 4-dinotefuran + α-cypermethrin, and the applications were carried out from the phenological stages V6/V8, R2, R4, R5.1, R5.5 and R 6.0. The control of bedbugs was measured at the time of application and seven days after the last application (V6/V8, R1, R4, R5.3, R5.5 and R6). Infestation, number of damaged grains, number of pods, number of pods per plant, and productivity were evaluated. The insect infestation was lower when the application was started early, preventively, still in the vegetative stages (V6-V8). The number of pods and productivity was higher when dinotefuran + α-cypermethrin was used in the initial stages (from V6/V8 to R4). Dinotefuran + α-cypermethrin was more efficient in grain preservation, presenting lower% of damaged grains with applications from the reproductive stage of the crop. The control is more efficient applying to the vegetative stages of the culture (V6 / V8), and the formulation dinotefuran + α-cypermethrin is the most indicated to control the main bugs of the soybean.