Minimizing Injury From At-Plant Herbicides In Cotton

Comments about cotton injury caused by residual at plant herbicides recommended for management of glyphosate-resistant Palmer amaranth are starting. Since many herbicide recommendations are driven by herbicide resistance, sometimes we have to live with a small amount of crop injury.  Colquitt County Ag Agent, Jeremy Kichler, has done work in Pigweed management while he was in Macon County. Here are a few tips from Jeremy’s blog, Colquitt County Ag Report, to help minimize cotton injury from at plant residual herbicides:

  1.  Plant higher vigor seed
  2. Shallow planting depth increases injury potential
  3. Plant into a moist soil (preplant irrigation may be needed)
  4. Apply proper residual herbicides within 24 hr of planting
  5. Avoid irrigation within 30 hr of planting (36 hr if cold)
  6. Avoid irrigation 24 hr before and 48 hr after emergence
  7. Irrigate to develop the perfect cotton stand; however, limit irrigation events during the first 2 weeks after planting to as few as possible after activating residual herbicides
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