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Palmer Amaranth (Amaranthus palmeri) and Devil's-claw (Proboscidea louisianica) Control in Cotton (Gossypium hirsutum) with Pyrithiobac

Published online by Cambridge University Press:  12 June 2017

Peter A. Dotray ,
J. Wayne Keeling ,
C. Gary Henniger  and
John R. Abernathy
Peter A. Dotray
Affiliation:
Texas Tech Univ., Lubbock, TX 79409
J. Wayne Keeling
Affiliation:
Texas Agric. Exp. Stn., Lubbock TX 79409-2122
John R. Abernathy
Affiliation:
Texas Agric. Exp. Stn., Lubbock, TX 79401
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Abstract

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.

Keywords

Pyrithiobac, 2-chloro-6-[(4,6-dimethoxy-2-pyrimidinyl)thio]benzoic aciddevil's-claw, Proboscidea louisianica (Mill.) Thellung #3 PROLOPalmer amaranth, Amaranthus palmeri S. Wats. #3 AMAPAcotton, Gossypium hirsutum L. ‘Paymaster HS26.'Application methodapplication ratecotton injurypostemergencepreemergencepreplant incorporatedAMAPAPROLO
Type
Research
Information
Weed Technology , Volume 10 , Issue 1 , March 1996 , pp. 7 - 12
Copyright
Copyright © 1996 by the Weed Science Society of America 

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