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Comparison of Glyphosate Products in Glyphosate-Resistant Cotton (Gossypium hirsutum) and Corn (Zea mays)

Published online by Cambridge University Press:  20 January 2017

Robert G. Parker ,
Alan C. York  and
David L. Jordan
Robert G. Parker*
Affiliation:
Department of Crop Science, Box 7620, North Carolina State University, Raleigh, NC 27695-7620
Alan C. York
Affiliation:
Department of Crop Science, Box 7620, North Carolina State University, Raleigh, NC 27695-7620
David L. Jordan
Affiliation:
Department of Crop Science, Box 7620, North Carolina State University, Raleigh, NC 27695-7620
*
Corresponding author's E-mail: [email protected]
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Abstract

Wide-spread planting of glyphosate-resistant (GR) crops in the United States and glyphosate patent expiration has led to a proliferation of glyphosate products. Growers have questioned their advisors on efficacy and crop tolerance of the many products available. Field experiments were conducted to evaluate eight glyphosate products in 2002 and ten in 2003, representing isopropylamine, diammonium, and potassium salts, applied POST and postemergence-directed (PDIR) at 630 and 1,680 g ae/ha for GR corn and GR cotton tolerance and weed control. There were no differences among products for control of six annual grass and 10 annual broadleaf weed species. No injury to corn from any glyphosate product at 630 or 1,680 g/ha or to cotton from 630 g/ha was noted at any of seven locations. ClearOut 41 Plus™, an isopropylamine salt of glyphosate, and Roundup WEATHERMAX™, a potassium salt of glyphosate, applied POST at 1,680 g/ha injured cotton 27 to 30% and 10 to 17%, respectively, at 3 of 7 locations. No cotton injury was noted with Glyfos®, Glyfos® X-TRA, Glyphomax™, Gly Star™ Original, Roundup Original™, Roundup UltraMAX®, Touchdown®, or Touchdown Total™. No differences were noted among glyphosate products or between rates for corn or cotton yield or cotton fiber properties.

Keywords

Glyphosatecorn, Zea mays L. ‘DK687’, ‘DKC 69-71’cotton, Gossypium hirsutum L. ‘DP 458 B/RR’, ‘ST 4892BR’ClearOut 41 Plus™crop tolerancediammonium salt of glyphosateGlyfos®Glyfos® X-TRAGlyphomax™Gly Star™ Originalisopropylamine salt of glyphosatepotassium salt of glyphosateRoundup Original™Roundup UltraMAX®Roundup WEATHERMAX™Touchdown®Touchdown Total™weed controlEPSPS, 5-enolpyruvylshikimate-3-phosphate synthase; GR, glyphosate-resistant; PDIR, postemergence-directed; PEP, phosphoenolpyruvate; WAP, wk after postemergence application; WAP1, wk after first postemergence application; WAP2, wk after second postemergence application; WAPD, wk after postemergence-directed application
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 4 , December 2005 , pp. 796 - 802
Copyright
Copyright © Weed Science Society of America 

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