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

  • Matthew S. Wiggins (a1), Robert M. Hayes (a1), Robert L. Nichols (a2) and Lawrence E. Steckel (a1)
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.

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*Corresponding author’s E-mail: lsteckel@utk.edu
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Associate Editor for this paper: Daniel Stephenson, Louisana State University Agricultural Center.

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References
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Weed Technology
  • ISSN: 0890-037X
  • EISSN: 1550-2740
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