This season's weather has resulted in many fields having to be treated with what must be considered less-than-timely herbicide applications. This situation creates several problems for applicators, one of them being obtaining adequate coverage of the target. The developing crop canopy intercepts much of the spray, thereby decreasing coverage of the weeds and exposing the crop to higher-than-label rates. Spraying fields with large crops present (>10 inches in height) can, therefore, result in poor weed control, crop injury, or both.
Iowa State University
Hartzler, Robert G., "Effect of crop canopy on spray coverage" (1999). Integrated Crop Management News. 2136.
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