Winter wheat (Triticum aestivum) response to flumioxazin soil residues from preceding dry bean (Phaseolus vulgaris) desiccation

Abstract

Nine field studies were conducted during 2011 to 2013 in Ontario to determine the effect of flumioxazin residues on winter wheat. For early- and mid-fall applied flumioxazin, there was no impact of the interval, 1, 2 or 4 weeks pre-plant (WPP), between flumioxazin application and winter wheat planting on injury, plant height, and yield. Injury was low, ranging from 0% to 4%, and was generally higher when flumioxazin was applied at 142.8 g ai ha−1 compared with 35.7 or 71.4 g ai ha−1. For late-fall applications, there was greater injury in the fall when flumioxazin was applied 2 WPP vs. 1 WPP. When combined over flumioxazin rates, winter wheat injury was 16% to 24% and 0% to 3% at 2 and 1 WPP, respectively. Injury increased when the rate increased from 35.7 to 142.8 g ai ha−1. Flumioxazin applied at 142.8 g ai ha−1 caused 1%, 5%, and 6% injury when applied 1 WPP and 32%, 53%, and 37% injury when applied 2 WPP at 1, 2, and 3 weeks after emergence in winter wheat, respectively. In all studies, flumioxazin applied at 35.7, 71.4 or 142.8 g ai ha−1 applied at various application timings caused no adverse effect on winter wheat height and yield.