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The first 40 days are very critical to the development of a cotton plant; plants are extremely sensitive to wary-season weed competition. Improperly timed or ineffective weed management applications may cause a significant reduction in yield opportunity. For optimal weed management, any preemergence or postemergence herbicide application should be made when weeds less than 4 inches tall.
To read more about early-season weed management in cotton in the Midsouth, check out this article from Roundup Ready PLUS®.