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United States Department of Agriculture

Agricultural Research Service

Research Project: CONSERVATION SYSTEMS RESEARCH FOR IMPROVING ENVIRONMENTAL QUALITY AND PRODUCER PROFITABILITY Title: Weed Management and Crop Response with Glyphosate, S-metolachlor, Trifloxysulfuron, Prometryn, and MSMA in Glyphosate-Resistant Cotton (Gossypium hirsutum L.)

Authors
item Clewis, Scott - NORTH CAROLINA STATE
item Miller, Donnie - NORTHEAST RES. STATION
item Koger Iii, Clifford
item Baughman, Todd - TEXAS A&M
item Price, Andrew
item Porterfield, Dunk - SYNGENTA CROP PROTECTION
item Wilcut, John - NORTH CAROLINA STATE

Submitted to: Weed Technology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: September 1, 2007
Publication Date: April 1, 2008
Citation: Clewis, S.B., Miller, D.K., Koger III, C.H., Baughman, T.A., Price, A.J., Porterfield, D., Wilcut, J.W. 2008. Weed management and crop response with glyphosate, s-metolachlor, trifloxysulfuron, prometryn, and MSMA in glyphosate-resistant cotton (gossypium hirsutum L.). Weed Technology. 22:160-167.

Interpretive Summary: Field studies were conducted in five states at six locations from 2002 through 2003 to evaluate weed control and cotton response to systems utilizing glyphosate, s-metolachlor, trifloxysulfuron, prometryn, and MSMA. With few exceptions, broadleaf weed control was similar with trifloxysulfuron or in combination with glyphosate or MSMA herbicide treatments. Cotton lint yield was increased 330 to 910 kg/ha with the addition of a postemergence herbicide treatment compared to systems without a postemergence or postemergence-directed treatment. The addition of a LAYBY herbicide treatment increased cotton lint yield by 440 kg/ha compared to systems without a LAYBY.

Technical Abstract: Field studies were conducted in five states at six locations from 2002 through 2003 to evaluate weed control and cotton response to EPOST, POST, and LAYBY systems utilizing glyphosate-TM (trimethylsulfonium salt), s-metolachlor, trifloxysulfuron, prometryn, and MSMA. Early-season cotton injury and discoloration was minimal (<1%) with all treatments, mid- and late-season injury was (<2%) except for trifloxysulfuron POST (11 and 9%, respectively). Annual grasses evaluated included barnyardgrass, broadleaf signalgrass, goosegrass, and large crabgrass. Broadleaf weeds evaluated included entireleaf morningglory, pitted morningglory, sicklepod, and smooth pigweed. Annual broadleaf and grass control was increased with the addition of s-metolachlor to glyphosate-TM EPOST systems compared with glyphosate-TM EPOST alone systems, except for sicklepod control where equivalent control was observed. Annual grass control was better with glyphosate-TM plus trifloxysulfuron post-directed spray (PDS) than with trifloxysulfuron POST or PDS or trifloxysulfuron plus MSMA PDS. With few exceptions, broadleaf weed control was similar with trifloxysulfuron applied POST alone or PDS alone or in combination with glyphosate-TM PDS or MSMA PDS herbicide treatments. The addition of a LAYBY herbicide treatment increased control both annual and broadleaf weeds by 11 to 36 percentage points compared to systems without a LAYBY. Cotton lint yield increased 420 kg/ha with the addition of s-metolachlor to glyphosate-TM EPOST treatments. Cotton lint yield was increased 330 to 910 kg/ha with the addition of a POST herbicide treatment compared to systems without a POST or PDS treatment. The addition of a LAYBY herbicide treatment increased cotton lint yield by 440 kg/ha compared to systems without a LAYBY.

Last Modified: 10/22/2014
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