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Weed Control Alternatives for Field Corn

Extension Specialist Eric Prostko put out some comments on alternative weed control in corn for 2022. You can read his points here:

I continue to hear much chatter about the shortages/price increases for Roundup (glyphosate) and many other herbicides.  Thus, I would like to remind you of some of the options available to field corn growers who are trying to be more judicious with their use of glyphosate and/or get away from it completely.  Please consider the following:

1) Growers who are having trouble finding glyphosate and/or don’t like the price, might have a better chance of getting it in a pre-mix formulation.  The following are various glyphosate pre-mixtures for use on field corn:

**Note: Enlist Duo can be applied preplant to any field corn hybrid but can only be applied postemergence on Enlist field corn hybrids.

 2)  Roundup-Ready field corn was first commercialized in 1998.  Prior to that time, field corn growers were managing weeds in-crop without glyphosate.  It might not have always been easy or perfect but it was good enough to make top yields.  Since that time, there have been other herbicides developed for use in field corn.  The following table lists various field corn herbicides that have been tested by UGA and will provide very acceptable weed control when applied at the V3-V5 stage of growth (still need to be tank-mixed with atrazine): 

3) If a grower chooses to not use glyphosate, I would anticipate slightly less overall grass weed control.  Thus, field corn growers should consider the use of the following herbicides for residual grass control in field corn: Anthem Maxx; Dual Magnum; Outlook; Prowl (POST only); Warrant; and Zidua.4) More specific information about the use of these herbicides can be found in the 2022 Georgia Pest Control Handbook – Special Bulletin 28 available on-line at the following address:

https://extension.uga.edu/content/dam/extension/programs-and-services/integrated-pest-management/documents/handbooks/2022-comm-chapters/Corn.pdf