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Cover Crop and Postemergence Herbicide Integration for Palmer amaranth Control in Cotton

Published online by Cambridge University Press:  10 May 2017

Matthew S. Wiggins
Affiliation:
Former Graduate Research Assistant, Professor, Professor, Department of Plant Sciences, University of Tennessee, 605 Airways Blvd., Jackson, TN 38301
Robert M. Hayes
Affiliation:
Former Graduate Research Assistant, Professor, Professor, Department of Plant Sciences, University of Tennessee, 605 Airways Blvd., Jackson, TN 38301
Robert L. Nichols
Affiliation:
Senior Director, Cotton Incorporated, 6399 Weston Park Way, Carey, NC 27513
Lawrence E. Steckel*
Affiliation:
Former Graduate Research Assistant, Professor, Professor, Department of Plant Sciences, University of Tennessee, 605 Airways Blvd., Jackson, TN 38301
*
*Corresponding author’s E-mail: lsteckel@utk.edu

Abstract

Field experiments were conducted to evaluate the integration of cover crops and POST herbicides to control glyphosate-resistant Palmer amaranth in cotton. The winter-annual grasses accumulated the greatest amount of biomass and provided the most Palmer amaranth control. The estimates for the logistic regression would indicate that 1540 kg ha−1 would delay Palmer amaranth emerging and growing to 10 cm by an estimated 16.5 days. The Palmer amaranth that emerged in the cereal rye and wheat cover crop treatments took a longer time to reach 10 cm compared to the hairy vetch and crimson clover treatments. POST herbicides were needed for adequate control of Palmer amaranth. The glufosinate-based weed control system provided greater control (75% vs 31%) of Palmer amaranth than did the glyphosate system. These results indicate that a POST only herbicide weed management system did not provide sufficient control of Palmer amaranth, even when used in conjunction with cover crops that produced a moderate level of biomass. Therefore, future recommendations for GR Palmer amaranth control will include integrating cover crops with PRE herbicides, overlaying residual herbicides in-season, timely POST herbicide applications, and hand weeding in order to achieve season-long control of this pest.

Type
Weed Management-Major Crops
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: Daniel Stephenson, Louisana State University Agricultural Center.

References

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