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:
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Plant higher vigor seed
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Shallow planting depth increases injury potential
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Plant into a moist soil (preplant irrigation may be needed)
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Apply proper residual herbicides within 24 hr of planting
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Avoid irrigation within 30 hr of planting (36 hr if cold)
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Avoid irrigation 24 hr before and 48 hr after emergence
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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
Thomas County Ag 