Italian Ryegrass and Wild Radish Control with Pre-emergent Herbicides, and Selectivity to Imadazolinone-resistant Wheat

Pre-emergence herbicide herbicides are an efficient way to manage weeds in wheat and could control Italian ryegrass and wild radish. We assess control of these weeds by PRE herbicides applied after crop sowing, as well as determining their phytotoxicity to imidazolinone resistant Clearfield® (CL) wheat. All trials involved testing of different PRE herbicides applied right after wheat sowing. Field trials were conducted in 2021 in two sites (Santo Angelo and Santa Maria), both sown with cv. TBIO Ello CL. Soils were classified as oxisol (53% clay) and ultisol (31% clay), respectively. In all trials, variables evaluated included visual assessments of injuries, number of plants, and weed control levels. Crop yield components were also determined in field experiments, whereas variables related to weed densities were assessed in trials. Clomazone, sulfentrazone, and quinclorac herbicides were not selective to wheat. Imidazolinones herbicides were shown to be selective, and a premix formulation containing imazapyr+imazapic allowed for broad-spectrum weed control, treatments containing PPO-inhibiting herbicides were the most effective for wild radish.