Paraquat and Slow Growing Peanuts Peanut Notes No. 96 2023

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I had a really good question yesterday about applying Gramoxone to peanuts that are growing slowly. Based on the label, Gramoxone and other formulations of paraquat need to be applied within 28 days after emergence. I am not aware of any data sets that address the pace of peanut growth during those 28 days and how that would affect use of this herbicide. As long as you are within this window of application, peanuts will recover from injury and yield will not be affected. We gain a great deal from Gramoxone from a weed management standpoint. As long as weeds are relatively small, this herbicide provides broad spectrum weed control and constitutes an additional mode of action for resistance management.

Always include Basagran at 8 oz per acre to reduce injury from paraquat. Some folks are applying paraquat with 1 pint of Storm rather than Basagran. This is also a good treatment. The Basagran in Storm reduces paraquat injury and the Blazer component increases control of some of our broadleaf weeds. Paraquat plus Storm is very popular in the southeastern US. With that said, I have seen less control of grasses with paraquat plus Storm compared with paraquat plus Basagran. I have also noticed that if the rate of Basagran is increased above 8 oz per acre annual grass control can drop off to a degree. For example, if you increase the Basagran rate to increase control of nutsedge when applying paraquat plus Basagran, annual grass control may decrease.

My preference is to apply paraquat plus Basagran (plus a residual herbicide) and then follow up with Storm plus 2,4-DB or another postemergence treatment as needed.