Ação de inseticidas via tratamento de sementes no controle de insetos praga em soja

Abstract

Commercial soybean (Glycine max L.) production is exposed to various factors that influence yield. Control over pests that attack seedlings in initial stages prevent plant failures over the field and consequent potential yield reduction. Pest control using seed treatment has been evidenced to be more efficient than aerial spraying. However, as any technology, it must be used in compliance with all technical procedures. The objective of this work was to analyze the efficiency of commercial products applied through seed treatment, in the control of pest insects in the soybean crop. The present work was conducted in the municipality of Lucas do Rio Verde - MT, in two harvests, in 2011 and 2012. Soybean seeds, cultivar 98Y12RR, precocious cycle, chemically treated industrially were used. The treatments consisted of the use of chemically treated seeds with three products at 200, 200 and 400 mL kg-1 of seeds, respectively, as described below: 1 - AVICTA® 500 FS (Abamectin); 2 - CRUISER® 350 FS (Thiamethoxam); 3 - STANDAK® TOP (Piraclostrobin + Methyl thiophanate + Fipronil). The evaluations were carried out in two 50 meter lines, containing, on average, six to eight plants per meter, duly flagged in each block, one at seven and one at 21 days after emergence. Evaluations of the incidence of pest insects (caterpillar-elm, soybean-cress and kitty) and yield were performed. It was concluded that the treatment of seeds with insecticides keeps the incidence of pests low and that the chemicals abamectin, thiamethoxam and the composition piraclotrobin + methyl thiophanate + fipronil present similarity as to the efficiency in the control of insect pests, and to the effect on the yield of the insect. Soybean crop.