Some questions have recently come in looking for herbicide options for corn in later vegetative stages. Adequate pre-emergence herbicides were applied; however, excessive rainfall and sandy soils resulted in weed emergence. While early-season weed control is critical to protect yield potential, in some situations, late-season weed control may be needed to protect yield, prevent harvest difficulties, and reduce additions to the weed seed bank.

Table 1 lists products that can be applied to corn over 12 inches tall to control emerged weeds. Note that some of these products recommend or require drop nozzles to reduce crop injury and get better spray coverage on weeds that are shorter than the crop. Also of note, strategies for more successful herbicide applications in high temperatures were discussed in an eUpdate article published on June 13.

Table 1. Herbicides labeled for corn over 12 inches tall to control emerged weeds.

For more detailed information, see the “2024 Chemical Weed Control for Field Crops, Pastures, and Noncropland” guide available online at https://www.bookstore.ksre.ksu.edu/pubs/CHEMWEEDGUIDE.pdf 

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