Recent rains across Iowa have halted field work and may have interfered with planned preemergence herbicide applications in corn. Corn and weed growth, however, continues. In situations where the corn, and most likely the weeds, have emerged prior to application of a planned soil-applied herbicide program, there are still options available. Most preemergence corn herbicides also can be applied postemergence in corn. A few exceptions include Axiom, Balance, and Epic, which may only be used prior to corn emergence.
Iowa State University
Schaefer, Kristine J. P., "Delayed soil-applied corn herbicide options" (2005). Integrated Crop Management News. 1369.
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