Much of Iowa has experienced frost or high winds, or both, in the past week, which can significantly affect herbicide performance. The recent frosts are a primary concern for no-till fields where burndown herbicides have been or will be applied to control existing vegetation. It is difficult to predict the influence of freezing temperatures because the response of weeds to these events is highly variable.
Iowa State University
Hartzler, Robert G., "Recent weather and herbicide performance" (2004). Integrated Crop Management News. 1593.
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