The recent period of below normal temperatures has a few implications in terms of weed management. Postemergence herbicides, including burndown treatments for no-till, are most effective on actively growing weeds. Thus, there is potential for reduced herbicide performance of products applied during this period. In some situations, weeds will be controlled effectively but will take longer to die. In other situations, significant reductions in weed control will occur.
Iowa State University
Hartzler, Robert G., "Herbicides and cold weather" (2005). Integrated Crop Management News. 1485.
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