Managing Glyphosate-Resistant Palmer Amaranth with Residual Herbicides in Midsouth Cotton

Roundup Ready and Flex production systems and the historical effectiveness of glyphosate have led to decreased use in residual herbicides to control problem weeds.  Delaying glyphosate applications and increasing rate and/or the number of applications has promoted a shift towards glyphosate-tolerant weeds and enhanced the evolution of glyphosate-resistant weed species.  Glyphosate-resistant Palmer amaranth has become a serious problem in the Midsouth in recent years.  Regional research was conducted to address management of glyphosate-resistant Palmer amaranth with residual herbicides in cotton.