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Weed Management Programs for Glyphosate-Tolerant Cotton (Gossypium hirsutum)

Published online by Cambridge University Press:  20 January 2017

Wilson H. Faircloth ,
Michael G. Patterson ,
C. Dale Monks  and
William R. Goodman
Wilson H. Faircloth*
Affiliation:
Department of Agronomy and Soils, Auburn University, AL 36849
Michael G. Patterson
Affiliation:
Department of Agronomy and Soils, Auburn University, AL 36849
C. Dale Monks
Affiliation:
Department of Agronomy and Soils, Auburn University, AL 36849
William R. Goodman
Affiliation:
Department of Agricultural Economics and Rural Sociology, Auburn University, AL 36849
*
Corresponding author's E-mail: wfairclo@acesag.auburn.edu.
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Abstract

Several herbicide-based weed management programs for glyphosate-tolerant cotton were compared in eight field studies across Alabama during 1996 and 1997. Weed management programs ranged from traditional, soil-applied residual herbicide programs to more recently developed total postemergence (POST) herbicide programs. Pitted morningglory and sicklepod control was best achieved with fluometuron applied preemergence (PRE) followed by (fb) a single POST over-the-top (POT) application of glyphosate fb a POST-directed application of glyphosate. Annual grass control was better with the preplant incorporated (PPI) programs at two of three locations in both years. Treatments that included at least one glyphosate POT application gave increased grass control over no glyphosate or pyrithiobac POT. Velvetleaf control was improved with the addition of glyphosate POT. A herbicide program using no POST herbicides yielded significantly less seed cotton than any program using POST herbicides at one location. PRE- and POST-only weed management programs at another location produced more seed cotton and gave greater net returns than PPI programs. Similarly, net returns at that same location were equivalent for both PRE- and POST-only programs, and less for PPI programs. POST-only programs yielded highest amounts of seed cotton and netted greater returns.

Keywords

Fluometuronglyphosatepyrithiobaccotton, Gossypium hirsutum L. ‘Deltapine 5415RR’, ‘Deltapine 5690RR’pitted morningglory, Ipomoea lacunosa L. # IPOLAsicklepod, Senna obtusifolia (L.) Irwin and Barneby # CASOBvelvetleaf, Abutilon theophrasti Medik. # ABUTHCotton yieldsherbicide costsherbicide-resistant cropstransgenic cottonANOVA, analysis of varianceEPDS, early postemergence-directed sprayEPOT, early postemergence over-the-topfb, followed byGCS, Gulf Coast Research and Education CenterLPDS, late postemergence-directed sprayLPOT, late postemergence over-the-topLSD, least significant differencePDS, postemergence-directed sprayPEF, Prattville Experimental FieldPOST, postemergencePOT, postemergence over-the-topPPI, preplant incorporatedPRE, preemergenceTVS, Tennessee Valley Research and Education CenterWGS, Wiregrass Research and Education Center
Type
Research
Information
Weed Technology , Volume 15 , Issue 3 , September 2001 , pp. 544 - 551
Copyright
Copyright © Weed Science Society of America 

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