Residual Herbicides in Corn Applied PRE and POST

Early season weed management is one step toward maximizing corn yield potential. Depending on product, residual herbicides may be applied to a crop pre-emergence (PRE) or post- emergence (POST). While POST applications are often feasible, additional challenges such as corn height, growth stage restrictions, and weed height restrictions need to be carefully followed to help protect yield potential and to maximize weed management.

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Two important factors to consider when addressing weed control with residual herbicides in corn are tank mix partners and carrier options. The options for these factors can vary greatly depending on whether it is a PRE or POST application.

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Tank Mix Partners

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Residual herbicides, such as Degree Xtra®, Harness® Xtra, Harvess® Xtra 5.6L, and TripleFLEX® II Herbicide, provide control of grasses and small seeded broadleaves, prior to weed emergence. These herbicides can be applied PRE or POST in corn up to 11-inches in height. Warrant® Herbicide also provides control of grasses and small seeded broadleaves prior to emergence and can be applied POST in corn up to 30 inches in height. Tank mix partners with these herbicides are generally added for management of large seeded broadleaves, triazine-resistant weeds, and emerged weeds, especially those that are though-to-control or are resistant to glyphosate.

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TripleFLEX II Herbicide and Warrant Herbicide may be tank mixed with any other herbicide labeled for use on corn at the appropriate application timing, provided the compatibility of the tank mix is verified by a jar test and tank mixing with them is not prohibited by the level of the tank mix partner. Degree Xtra, Harness Xtra, and Harness Xtra 5.6L can be tank mixed with the tank mix partners listed on the respective labels.13;10;

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Carrier Options

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Water or a fluid fertilizer, such as 28% urea ammonium nitrate (UAN), are common carriers. Both carriers are labeled for PRE applications with Degree Xtra, Harness Xtra, Harness Xtra 5.6L, and Warrant Herbicide must be applied with a water carrier to help minimize the risk of crop injury. It is not recommended to use 28% UAN as a carrier POST with TripleFLEX II Herbicide due to the potential for crop injury. Degree Xtra is one of the few residual herbicides that is labeled for POST applications with UAN as a carrier. While this is not the preferred situation, the flexibility of being able to apply nitrogen and weed control POST in corn in one pass can be beneficial. There are restrictions to help minimize crop injury when applying Degree Xtra POST with UAN as a carrier.

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Read more about residual herbicides in corn at RoundupReadyPLUS.com.​

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