The ongoing wet weather prevented many cornfields from being treated with planned postmergence treatments. The growth of corn during this period has eliminated many of the herbicide options that were planned for these fields. Table 1 shows products cleared for use on corn larger than 12 inches in height. Keep in mind that just because a product is labeled for use in large corn does not mean it will control large weeds that may be present in these fields. Also, the risk of crop injury increases with corn size for many products, especially when the corn is under stress.
Iowa State University
Hartzler, Robert G.; Owen, Michael D.; and Pringnitz, Brent A., "Options for weed control in large corn" (2001). Integrated Crop Management News. 1920.
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