Managing Palmer amaranth – or pigweed – with multiple resistance to glyphosate, ALS, and PPO herbicides will be complicated, say Mississippi State Extension weed scientist Jason Bond and Extension cotton specialist Darrin Dodds. However, excellent control of this species is still feasible.
According to the specialists, most populations of Palmer amaranth in the Mississippi Delta currently exhibit multiple resistance to glyphosate, ALS herbicides and some DNA herbicides. And, based on results of greenhouse screening, fields in Bolivar, Coahoma, Sunflower and Tunica counties – as well as adjacent counties – could likely contain pigweed resistant to PPO herbicides as well.
Herbicide selection will be severely limited in cotton fields that contain Palmer amaranth exhibiting multiple resistance. But, control is not impossible.
In a recent blog, Bond and Dodds outlined weed management suggestions for growers dealing with multiple resistance issues.
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