Inseticidas em tratamento de sementes visando o controle de corós rizófagos (coleoptera, melolonthidae) na cultura da soja no estado de Goiás e Distrito Federal

• Autor(a) principal: Santos, Jardel Barbosa dos
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/0013000006cz5
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tde/2979
• topic: Controle químico; Liogenys fusca; Phyllophaga capillata; redução de danos.; Chemical control; Liogenys fusca; Phylophaga capillata; AGRONOMIA::FITOSSANIDADE

This study had as objective to verify the potential use of seed treatment on soybean crop with insecticide in reducing the harm caused by white grub species present in Goiás state and Distrito Federal. For this three tests have been installed, two in areas with predominantly Phyllophaga capillata Blanchard, 1850 and one in area with Liogenys fusca Blanchard, 1851. The trials were installed in commercial soybean fields with the presence of damage, and the presence of larvae in second and third instar. After selecting the area, the soybean was removed and treatments sowed manually. Besides the check were evaluated in trial thiamethoxam (350 FS) at rates of 70 and 87.5 g active ingredient (a.i.)/100 kg of seeds, thiamethoxam + abamectin (350+500 FS) at rates of 70 +50 g a.i./100 kg of seeds, imidacloprid + thiodicarb (450 +150) FS at rates of 225 +75 g a.i. / 100 kg seeds, and fipronil (250 SC) at rates of 50 g a.i/100 kg seeds. In all trials was evaluated weekly plant mortality, and at 14 and 28 days after emergence (DAE) height and dry weight of shoot, length and dry weight of roots. The use of seed treatment showed lower plants mortality by P. capillata larvae, except fipronil at rates 50 g a.i./100 kg of seed. Among the insecticides evaluated the use of imidacloprid + thiodicarb highlighted in the protection of stand, a fact that was observed to final assessment at 56 DAE. In addition, there was also best effect of this insecticide in variables related to plant development and grain yield. However, in the area with a predominance of L. fusca, beyond the thiodicarb + imidacloprid, highlighted in reducing the damage the insecticide thiamethoxam at rates of 70 and 87.5 g a.i./100 kg of seed. Therefore, the use of seed treatment on the mentioned species is viable, but we observe that for satisfactory results with the use of seed treatment is important to correctly identify the predominant species.