Study Shows Fall Weed Controls Can Impact Glyphosate-Resistant Palmer Amaranth

An article published in the latest issue of the journal Weed Science shows that adopting harvest-time and postharvest weed controls can reduce the prevalence of glyphosate-resistant Palmer amaranth, a problematic weed in a variety of crops.

Scientists with the University of Arkansas and the University of Western Australia recently conducted a three-year field experiment to determine the impact of in-crop herbicides and fall weed management practices on Palmer amaranth. Researchers compared glyphosate-only weed control with preemergence herbicides, a residual glufosinate applied postemergence, and a variety of harvest-time and postharvest management options – used alone or in combination.

The harvest-time and postharvest controls included spreading crop residues or incorporating them into the soil, using cover crops, adopting windrowing with or without burning, and removing crop residues that contain weed seeds from the field.

The study showed that three controls in particular made a significant impact on the population density of Palmer amaranth – planting cover crops, removing crop residues, and incorporating crop residues into the soil. The effect of these fall controls on seed production, though, was inconsistent across the three years of the study.

When preemergence herbicides were added as part of an integrated control program, both Palmer amaranth population density and subsequent seed production were significantly reduced compared to a glyphosate-only program. The glufosinate-containing residual herbicide program also proved to be superior to the glyphosate-containing residual program in reducing Palmer amaranth seed production.

“Our study shows that farmers diversifying their weed management program can reduce both the prevalence of resistant weeds and the size of the soil seedbank, which can extend the useful life of the herbicides they rely on for weed control,” says Nicholas Korres, Ph.D., of the University of Arkansas.

Full text of the article “Integrating Herbicide Programs with Harvest Weed Seed Control and Other Fall Management Practices for the Control of Glyphosate-Resistant Palmer Amaranth” is now available in Weed Science Vol. 64, Issue 3, July-September, 2016.

 

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