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

Misha R. Manuchehri, Peter A. Dotray, J. Wayne Keeling

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

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. Twentyeight 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. Nomenclature: 2,4-D choline; glyphosate; glufosinate; Palmer amaranth, Amaranthus palmeri S. Wats.; cotton, Gossypium hirsutum L.

Original languageEnglish
Pages (from-to)793-798
Number of pages6
JournalWeed Technology
Volume31
Issue number6
DOIs
StatePublished - Dec 2017

Keywords

  • Enlist Duo
  • Enlist cotton
  • glyphosate resistance
  • tank mixtures

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