Evaluation of achieve for control of grassy weeds in wheat
Field studies were conducted in 1989 and 1990 at Aberdeen, Outlook, and Saskatoon to evaluate the efficacy of Achieve, Hoe-Grass, Assert, and Puma Super for green foxtail (Setaria viridis) and wild oat (Avena sativa) control in wheat. Treatments were applied under both dryland and irrigated conditions and included a range of herbicide rates to determine the dose required for control under each set of environmental conditions. Different weed leaf stages at the time of herbicide application were used to determine the effect of growth stage on herbicide efficacy. Under irrigation, Achieve provided good control of both green foxtail and wild oat at rates as low as 100 g/ha. Achieve activity was greater under irrigated than dryland conditions, suggesting that reduced rates may be used under conditions where moisture is not limiting. The efficacy of Achieve was greatly reduced by a delay in application from the 4-leaf stage to the 6-leaf stage of tame oat. At the 4-leaf stage. rates as low as 25 g/ha were effective; however. at the 6-leaf stage only the full rate (250 g/ha) provided acceptable control. Puma Super provided excellent control of green foxtail under both dryland and irrigated conditions. Overall, Achieve and Puma Super both provided a high degree of control of all weed species in the study. Assert and Hoe-Grass were less effective than the former herbicides.
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