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Corn planting has been start and stop, and generally delayed this spring. In some situations the decision was made to plant and not apply nitrogen, or planting progressed so quickly that UAN (urea-ammonium nitrate solution) and herbicide applications couldn’t keep up with the planters, and now there is emerged corn.  While UAN and many pre-emergence products can be applied to emerged corn, using UAN as a herbicide carrier enhances the foliar activity of products and may result in foliar damage. Check herbicide labels for restrictions on use of UAN as a carrier.

The weed control results from 2015 are now available.  The report includes experiments and demonstrations conducted at several of the Iowa State University Research Farms, as well as farmer fields.  Highlights include experiments that report on herbicide tactics to control waterhemp with evolved resistance to HPPD inhibitor herbicides and glyphosate-resistant biotypes.  If you have questions concerning the report, please contact Mike Owen at 515-294-5935 or mdowen@iastate.edu.