Several factors may delay postemergence herbicide applications. When this happens it is important to be aware of restrictions on the label based on corn size or growth stage. The reasons for these restrictions vary among products, but may involve crop tolerance and prevention of residues in soil or grain. When making application to fields that received frost damage, remember toconsider the number of leaves lost to frost.
Iowa State University
Hartzler, Robert G., "Timing Restrictions for Postemergence Herbicides in Corn" (2010). Integrated Crop Management News. 425.
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