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Since mid-July, I have received several grower inquiries regarding mid-late season weed control in peanut. Most of them were related to large morningglory, sicklepod, coffeeweed, pigweed, FL pusley, etc. Growers wanted to know what options they can spray to control those weeds when their peanut is around 90 days old. I hate to tell them use a bushhog to mow weeds down, but at this point, herbicide options are limited due to pre-harvest interval (PHI) restrictions on herbicide labels. For example, a PHI of 90 days means that growers cannot apply this herbicide within 90 days before harvest.
It is understandable that growers may have a few patches of weeds in mid-late season that they want to clean up. However, if someone is in deep trouble with weeds when his peanut is at 90 days after planting, I believe that he did not use proper postemergence treatments early on in his crop. Lack of residual herbicides in early postemergence treatments is a major cause for this problem. Chloroacetamide herbicides such as Dual Magnum, Zidua, Outlook and Warrant applied at full label rate can usually provide 20-30 days of residual weed control and they are critical components to a successful season-long weed control program in peanut.
As a conclusion, for those who struggle with mid-late season weed problems in peanut:
Extension Weed Scientist, Assistant Professor
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