Although there are many ways weeds escape control in crop fields, one of the leading causes of waterhemp control failures is emergence of plants following postemergence herbicide (POST) treatments. Waterhemp requires more than twice as many growing degree days to reach 50% emergence as giant foxtail or velvetleaf (Figure 1), resulting in much of the population emerging after mid-June.
Iowa State University
Hartzler, Robert G. and Anderson, Meaghan, "Achieving Full-season Waterhemp Control in Soybean" (2019). Integrated Crop Management News. 2514.
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