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Effect of Residual Herbicides Used in the Last POST-Directed Application on Weed Control and Cotton Yield in Glyphosate- and Glufosinate-Resistant Cotton

Published online by Cambridge University Press:  20 January 2017

Clifford H. Koger ,
Andrew J. Price ,
Joel C. Faircloth ,
John W. Wilcut  and
Steve P. Nichols
Clifford H. Koger*
Affiliation:
USDA-ARS, Southern Weed Science Research Unit, 141 Experiment Station Road, P.O. Box 350, Stoneville, MS 38776
Andrew J. Price
Affiliation:
U.S. Department of Agriculture–Agricultural Research Service, National Soil Dynamics Laboratory, 411 Donahue Drive, Auburn, AL 36832
Joel C. Faircloth
Affiliation:
Soil, and Environmental Sciences, Tidewater AREC, Virginia Tech University, Blacksburg, VA 24061
John W. Wilcut
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Steve P. Nichols
Affiliation:
Fiber Max Cotton, Lubbock, TX 79424
*
Corresponding author's E-mail: tkoger@drec.msstate.edu
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Abstract

Field experiments were conducted to evaluate weed control and cotton response to glyphosate or glufosinate applied alone or with residual herbicides applied in the last POST-directed application (LAYBY) in glyphosate- and glufosinate-resistant cotton. Glyphosate (0.86 kg ae/ha) or glufosinate (0.47 kg ai/ha) were applied alone over the top of glyphosate- or glufosinate-resistant cotton early POST (EPOST) followed by (fb) late POST (LPOST) fb one of the herbicides applied either alone or with a residual herbicide at LAYBY. Glyphosate- and glufosinate-based treatments were applied only to glyphosate- and glufosinate-resistant cotton, respectively. Residual herbicides evaluated included prometryn (1.12 kg ai/ha), fluometuron (1.12 kg ai/ha), diuron (1.12 kg ai/ha), oxyfluorfen (1.12 kg ai/ha), pendimethalin (1.0 kg ai/ha), prometryn + trifloxysulfuron (1.33 kg ai/ha + 12 g ai/ha), or linuron + diuron (0.56 + 0.56 kg ai/ha). Glyphosate-and glufosinate-based weed management systems with and without residual LAYBY herbicides resulted in little to no injury to cotton. Three applications of glyphosate or glufosinate alone provided better full-season control of most species when compared to two applications of either herbicide. The addition of a residual herbicide to glyphosate or glufosinate at LAYBY did not improve cotton yields, but did improve overall control of barnyardgrass and yellow nutsedge and reduced weed dry biomass present at time of cotton harvest when compared to three applications of glyphosate or glufosinate alone.

Keywords

Diuronfluometuronglufosinateglyphosatelinuronoxyfluorfenpendimethalinprometryntrifloxysulfuronbarnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCGyellow nutsedge, Cyperus esculentus L. CYPEScotton, Gossypium hirsutum L. ‘DPL 555BG/RR’, ‘Fibermax 958LL, 966LL, and 989RR’CGA-362622crop injuryglyphosate-resistant cottonLiberty Link® cottonresidual weed controlRoundup Ready® cottontransgenic crops
Type
Research
Information
Weed Technology , Volume 21 , Issue 2 , June 2007 , pp. 378 - 383
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Assistant Research Professor, Delta Research and Extension Center, Mississippi State University, P.O. Box 197, Stoneville, MS 38776.

References

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