Palmer amaranth (Amaranthus palmeri) and devil's-claw (Proboscidea louisianica) control in cotton (Gossypium hirsutum) with pyrithiobac

Peter A. Dotray, J. Wayne Keeling, C. Gary Henniger, John R. Abernathy

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Field experiments conducted in 1991, 1992, and 1993 evaluated Palmer amaranth and devil's-claw control and cotton injury with pyrithiobac applied PPI, PRE, or POST. Pyrithiobac at 36 or 71 g ae/ha applied PPI, PRE, or POST did not injure cotton. Pyrithiobac at 140 g/ha applied PPI or PRE injured cotton 9 to 11% 6 wk after treatment. Cotton recovered and no injury was observed 12 wk after treatment. Pyrithiobac applied PPI and PRE at 71 g/ha controlled Palmer amaranth at least 97% 6 wk after treatment. Palmer amaranth control with pyrithiobac applied POST was more variable and influenced by environmental conditions. Palmer amaranth control with 71 g/ha of pyrithiobac exceeded that with 36 g/ha. Devil's-claw control with pyrithiobac was better with POST applications than PPI or PRE applications. Pyrithiobac applied POST at 140 g/ha controlled devil's-claw 83-97%. These studies indicate that pyrithiobac can effectively control Palmer amaranth and devil's-claw in cotton on the Texas Southern High Plains when applied at appropriate rates and timings. Nomenclature: Pyrithiobac, 2-chloro-6-[(4,6-dimethoxy-2-pyrimidinyl)thio]benzoic acid; devil's-claw, Proboscidea louisianica (Mill.) Thellung #3 PROLO; Palmer amaranth, Amaranthus palmeri S. Wats. #3 AMAPA; cotton, Gossypium hirsutum L. 'Paymaster HS26.'.

Original languageEnglish
Pages (from-to)7-12
Number of pages6
JournalWeed Technology
Issue number1
StatePublished - 1996


  • Application method
  • Application rate
  • Cotton injury
  • Postemergence
  • Preemergence
  • Preplant incorporated


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