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Interaction of Pyrithiobac and Graminicides for Weed Control in Cotton (Gossypium hirsutum)

Published online by Cambridge University Press:  20 January 2017

W. James Grichar ,
Brent A. Besler ,
Kevin D. Brewer  and
Robert G. Lemon
W. James Grichar*
Affiliation:
Texas Agricultural Experiment Station, P.O. Box 755, Yoakum, TX 77995
Brent A. Besler
Affiliation:
Texas Agricultural Experiment Station, P.O. Box 755, Yoakum, TX 77995
Kevin D. Brewer
Affiliation:
Texas Agricultural Experiment Station, P.O. Box 755, Yoakum, TX 77995
Robert G. Lemon
Affiliation:
Texas Agricultural Extension Service, College Station, TX 77843
*
Corresponding author's E-mail: w-grichar@tamu.edu
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Abstract

Field studies were conducted from 1996 through 1998 to evaluate control of broadleaf signalgrass and slender amaranth by clethodim, fluazifop-P-butyl, and fluazifop-P-butyl plus fenoxaprop-P-ethyl applied alone, in combination with pyrithiobac, or sequentially with pyrithiobac. Broadleaf signalgrass control with graminicides alone was 75 to 100%. Although broadleaf signalgrass control with clethodim was not reduced by pyrithiobac, control with fluazifop-P-butyl and fluazifop-P-butyl plus fenoxaprop-P-ethyl was reduced by pyrithiobac. Pyrithiobac controlled slender amaranth 85 to 100% when applied alone. However, slender amaranth control by pyrithiobac was inconsistent when pyrithiobac was applied in mixture or sequentially with graminicides. A reduction in slender amaranth control may have resulted from a combination of reduced graminicide efficacy and interference caused by broadleaf signalgrass with slender amaranth (pyrithiobac alone). Cotton yields were highest when pyrithiobac was applied 24 h after graminicides.

Keywords

Clethodimfenoxaprop-P-ethylfluazifop-P-butylpyrithiobacbroadleaf signalgrass, Brachiaria platyphylla (Griseb.) Nash # BRAPPslender amaranth, Amaranthus gracilis Desf. # AMAVIcotton, Gossypium hirsutum L. ‘Deltapine 50’, ‘Paymaster H-1215’, ‘DP5690RR’Amaranthus gracilisAMAVIantagonismBrachiaria platyphyllaBRAPPherbicide interactionPOST, postemergencePRE, preemergenceWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 17 , Issue 3 , September 2003 , pp. 461 - 466
Copyright
Copyright © Weed Science Society of America 

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References

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