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EnlistTM Weed Control Systems for Palmer Amaranth (Amaranthus palmeri) Management in Texas High Plains Cotton

Published online by Cambridge University Press:  19 September 2017

Misha R. Manuchehri ,
Peter A. Dotray  and
J. Wayne Keeling
Misha R. Manuchehri*
Affiliation:
Former Graduate Research Assistant and Professor, Department of Plant and Soil Science, Texas Tech University, Lubbock, TX 79409
Peter A. Dotray
Affiliation:
Former Graduate Research Assistant and Professor, Department of Plant and Soil Science, Texas Tech University, Lubbock, TX 79409
J. Wayne Keeling
Affiliation:
Professor, Texas A&M AgriLife Research, Lubbock, TX 79403.
*
*Corresponding author’s E-mail: [email protected]
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Abstract

Weed management systems were established near Lubbock, TX in 2013, 2014, and 2015 to assess the effectiveness of premixed 2,4-D choline+glyphosate alone and in combination with glufosinate and soil-residual herbicides for Palmer amaranth control. Systems consisted of trifluralin applied preplant incorporated followed by an early POST application followed by a mid-POST application. Palmer amaranth control 21 days after the early POST application ranged from 75 to 90% for all treatments that included 2,4-D choline+glyphosate alone or in a tank-mixture in 2013. Twenty-eight days after the mid-POST application, Palmer amaranth was controlled 86 to 99% for all herbicide systems with the exception of systems that included a mid-POST application of glufosinate alone. Combined across 2014 and 2015, Palmer amaranth control 21 days after the early POST application ranged from 96 to 98% for all systems that included 2,4-D choline+glyphosate, 2,4-D choline alone, or 2,4-D choline in a tank-mixture. Combined across 2014 and 2015, Palmer amaranth control 28 days after the mid-POST application ranged from 95 to 100% with the exception of the following: trifluralin preplant incorporated followed by glufosinate with or without acetochlor applied early POST followed by glufosinate mid-POST and trifluralin preplant incorporated followed by glyphosate early POST followed by glyphosate mid-POST. Overall, numerous effective systems were identified; however, systems containing 2,4-D choline+glyphosate or 2,4-D choline early POST and/or mid-POST were among the most effective. Glyphosate or glufosinate only systems or systems that relied on glufosinate alone at the mid-POST timing were inconsistent and often performed poorly.

Keywords

2,4-D cholineglyphosateglufosinatePalmer amaranth, Amaranthus palmeri S. Wats.cotton, Gossypium hirsutum L.Enlist cottonEnlist Duoglyphosate resistancetank mixtures
Type
Weed Management-Major Crops
Information
Weed Technology , Volume 31 , Issue 6 , December 2017 , pp. 793 - 798
Copyright
© Weed Science Society of America, 2017 

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Footnotes

a

Current address of first author: Department of Plant and Soil Sciences, Oklahoma State University, 371 Agricultural Hall, Stillwater, OK 74078.

Associate Editor for this paper: Jason Bond, Mississippi State University

References

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