GRAMINICIDAS TÊM EFEITO PARA O CONTROLE DE CAPIM-AMARGOSO (Digitaria insularis) SOB CONDIÇÃO DE ESTRESSE?

Abstract

This research aimed to assess the effectiveness of graminicides in controlling sourgrass (Digitaria insularis) under water stress conditions. Sourgrass has caused significant losses in crops due to its resistance to glyphosate, a widely used herbicide in Brazil. The experiment was conducted at the Federal Institute of Goiano – Campus Urutaí, during June 2022. Different herbicides were used in the experimental groups, in (g. i.a. ha-1): Poquer (Cletodim 240); Verdct® Max (Haloxifope-P-metílico 135); Podium® EW (Fenoxaprope-P-etílico 165); Poquer (Cletodim 240) + Verdict® Max (Haloxifope-P-metílico 135); Poquer (Cletodim 240) + Podium® EW (Fenoxaprope-P-etílico 165); Verdict® Max (Haloxifope-P-metílico 135) + Podium® EW (Fenoxaprope-P-etílico (165). Applications were performed on mature and perennialized plants, and evaluations were conducted at 7, 14, 21, and 28 days after application. Phytotoxicity ratings were recorded at all evaluation intervals, and dry mass was collected 28 days after application. All treatments showed effective control, with efficiency above 80%, indicating success in reducing sourgrass under the studied conditions.