Although glyphosate provided superior weed control in the early years, most of the weeds in the dataset showed signs of adaptation to the chemical in just two to three years.
Ohio State University Extension stresses that growers should have a zero tolerance policy on Palmer amaranth and what they can do to prevent the weed from establishing.
Purdue University weed scientists recommend growers with glyphosate-resistant Palmer amaranth and waterhemp use Group 15 or Group 5 herbicides in conjunction with their PPO-inhibitors.
Researchers found that a grass and legume cover crop combination produced the most biomass and reduced emergence of glyphosate-resistant Palmer amaranth by half.
A study found that pre-emergence herbicide treatments combined with a post-emergence herbicide applied 3-4 weeks afterwards delivered 94% or greater control of Palmer amaranth and waterhemp.
Researchers at the University of Tennessee found that post-harvest treatment of glyphosate-resistant Palmer amaranth provided 98% control 7 days after application.
Glyphosate-resistant Palmer amaranth and waterhemp have spread across Kentucky, indicating that they continue to be a growing threat to grain crop production in the state.
A Purdue University Extension study found that the use of adjuvants on glyphosate resistance Palmer amaranth improved control, but was still well below commercially acceptable levels.
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