MANAGEMENT OF VOLUNTARY SOYBEAN INFESTING WITH BEAN THE HERBICIDE ETHOXYSULFURON

Abstract

he sowing of beans after soybean harvest can be a problem since the voluntary plants ofthe crop emerge after harvesting and compete with beans. The herbicide ethoxysulfuron hasbeen used for the management of different species of weeds, among them the voluntaryweed soybean in the cultivation of beans. Therefore, this study was developed with theobjective of evaluating the selectivity and effectiveness of different doses of ethoxysulfuronapplied to common bean for the control of voluntary soybeans. The experiment wasinstalled in a randomized block design, with four replications. The tested treatments were:0, 12, 24, 36 and 48 g ha-1 of active ingredient of ethoxysulfuron. At 10, 20 and 30 daysafter application of the treatments (DAT), the control of voluntary soybean andphytotoxicity to the IPR Tuiuiú bean cultivar were visually evaluated. In the bean harvest,the mass of a thousand grains (g) and grain yield (kg ha-1) were determined. The increase inethoxysulfuron doses contributed to the increase in the control efficiency of voluntarysoybean infesting beans. The highest phytotoxicities to common bean cultivar IPR Tuiuiúwere caused by the use of the highest doses of ethoxysulfuron. The dose of 25.8 g ha-1 ofethoxysulfuron caused the highest grain yield of the bean cultivar IPR Tuiuiú, with controlof 98.9% of the voluntary soybean and phytotoxicity around 21%.