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Glyphosate-Resistant Cotton (Gossypium hirsutum) Response and Weed Management with Trifloxysulfuron, Glyphosate, Prometryn, and MSMA

Published online by Cambridge University Press:  20 January 2017

Walter E. Thomas ,
Tim T. Britton ,
Scott B. Clewis ,
Shawn D. Askew  and
John W. Wilcut
Walter E. Thomas
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Tim T. Britton
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Scott B. Clewis
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Shawn D. Askew
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Glade Road, Blacksburg, VA 24061-0330
John W. Wilcut*
Affiliation:
Crop Science Department, Box 7620, North Carolina State University, Raleigh, NC 27695-7620
*
Corresponding author's E-mail: john_wilcut@ncsu.edu
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Abstract

Field studies were conducted at three locations to evaluate glyphosate-resistant (GR) cotton response, weed control, and cotton lint yields to two formulations of glyphosate (diammonium salt– glyphosate and isopropylamine salt–glyphosate) and trifloxysulfuron applied early postemergence (EPOST) alone or to tank mixtures of trifloxysulfuron with each glyphosate formulation, with and without a late postemergence-directed (LAYBY) treatment of prometryn plus MSMA. Trifloxysulfuron and both formulations of glyphosate controlled common lambsquarters and pitted morningglory. Both glyphosate formulations provided equivalent control of common lambsquarters, goosegrass, pitted morningglory, prickly sida, and smooth pigweed. Trifloxysulfuron controlled smooth pigweed better than either glyphosate formulation but did not control goosegrass or prickly sida. Prometryn plus MSMA LAYBY improved late-season control of common lambsquarters, goosegrass, large crabgrass, and pitted morningglory for all EPOST systems and improved late-season smooth pigweed control for EPOST systems that did not include trifloxysulfuron. Cotton injury was 2% or less from both glyphosate formulations, while trifloxysulfuron injured ‘Deltapine 5415RR’ 7 to 16% at two locations. At a third location, trifloxysulfuron injured ‘Paymaster 1218RR/BG’ 24%, and when applied in mixture with either glyphosate formulation, injury increased to at least 72%. Cotton injury was transient at the first two locations and was not visually apparent 3 to 5 wk later. Cotton yield at the third location was reduced. High cotton yields reflected high levels of weed control.

Keywords

GlyphosateMSMAprometryntrifloxysulfuroncommon lambsquarters, Chenopodium album (L.) Roth #3 CHEALgoosegrass, Eleusine indica (L.) Gaertn. # ELEINlarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSApitted morningglory, Ipomoea lacunosa Gray # IPOLAprickly sida, Sida spinosa L. # SIDSPsmooth pigweed, Amaranthus hybridus L. # AMACHcotton, Gossypium hirsutum L. ‘Paymaster 1218RR/BG’, ‘Deltapine 5415RR’Diammonium saltisopropylamine saltDIA, diammonium salt of glyphosateIPA, isopropylamine salt of glyphosatePOT, postemergence over the top
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 1 , March 2006 , pp. 6 - 13
Copyright
Copyright © Weed Science Society of America 

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