The prolonged cool, wet weather has complicated application decisions for postemergence herbicides. The stressful conditions may have reduced crop tolerance and prevented timely herbicide applications. Most growers realize that it would be wise not to treat corn under these conditions, but they may not have the flexibility to delay applications because of time limitations, crop stage, or weed size. A frequently asked question is how many days of warm weather are needed before the crop will regain its vigor? Unfortunately, there is no simple answer because many interacting factors affect the crop's recovery. However, the following are guidelines that may help in the decision process
Iowa State University
Hartzler, Robert G. and Pringnitz, Brent A., "Herbicide applications on stressed corn" (2001). Integrated Crop Management News. 1963.
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