Eficácia e seletividade de associações de herbicidas utilizados em pós-emergência na cultura do milho

The objective of this work was to evaluate herbicides efficacy and selectivity applied in post-emergence for controlling weeds in two corn cultivars. The experiment was conducted between December/2007 and April/2008, at FEP – UNESP, Selviria County/MS. The experiment was conducted in conventional tillage, by using seven treatments and four replications, in split plot scheme for cultivar factor: Pioneer 30 S31 and Dow Agroscience 2B710. Applications were effected in crops and weeds post-emergence, 7 and 14 days after crop emergence, by using a pressurized sprayer (CO2), with spray volume of 200 L.ha-1. It was concluded that the treatments: HerbitrinTM + AccentTM + Joint OilTM (2500 mL + 25 g. ha-1 + 0,5% v/v); HerbitrinTM + Sanson 40 SCTM + Joint OilTM (2500 mL + 470 mL ha-1 + 0,5% v/v); HerbitrinTM + CallistoTM + Joint OilTM (2500 mL + 250 mL ha-1 + 0,5% v/v); and sequential applications of HerbitrinTM + AccentTM + Joint OilTM (1250 mL + 21 g ha-1 + 0,5% v/v))/ HerbitrinTM + CallistoTM + Joint OilTM (1250 mL + 125 mL ha-1 + 0,5% v/v); HerbitrinTM + CallistoTM + Joint OilTM (1250 mL + 125 mL ha-1 + 0,5% v/v)/ HerbitrinTM + AccentTM + Joint OilTM (1250 mL + 21 g ha-1 + 0,5%v/v) and HerbitrinTM + AccentTM + CallistoTM + Joint OilTM (1250 mL + 13 g + 100 mL ha-1 + 0,5% v/v)/(1250 mL + 13 g + 100 mL ha-1 + 0,5% v/v) were highly selective to Pioneer 30 S31 and Dow Agroceres 2B710 cultivars, with expressive efficacy in controlling Amaranthus deflexus, Ipomoea nil, Commelina benghalensis e Panicum maximum weeds. It was also observed that these treatments may be recommended for controlling weed in corn crop.