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1 April 2007 Using Trifloxysulfuron with Glyphosate for Cotton Weed Control
W. James Grichar, Brad W. Minton
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Field studies were conducted during the 2002 thru 2004 growing seasons at two locations in the south-central Texas cotton-production region to evaluate trifloxysulfuron and trifloxysulfuron plus prometryn in combination with either S-metolachlor or glyphosate or both for weed control and cotton response. Cotton leaf burn (13 to 19%) was noted in 2002 at one location with trifloxysulfuron plus prometryn applied late POST-directed (LPDIR). Herbicide combinations that included trifloxysulfuron controlled barnyardgrass, hemp sesbania, yellow nutsedge, Palmer amaranth, smooth pigweed, ivyleaf morningglory, pitted morningglory, and smellmelon at least 80% in most instances. Glyphosate applied early POST over-the-top (EPOTT) and mid-POST over-the-top (MPOTT) at 0.84 kg ai/ha followed by trifloxysulfuron plus prometryn at 1.1 kg ai/ha applied LPDIR controlled the above-mentioned weeds plus Texas panicum at least 94%. No other herbicide systems provided effective control (greater than 79%) of Texas panicum. Higher cotton yields in 2002 were obtained with herbicide systems that included glyphosate alone or glyphosate plus S-metolachlor applied EPOTT or LPOTT followed by trifloxysulfuron plus prometryn applied LPDIR, whereas in 2003, none of the herbicide systems increased yield over the nontreated check.

Nomenclature: Glyphosate; S-metolachlor; trifloxysulfuron; prometryn; trifloxysulfuron; barnyardgrass, Echinochloa crus-galli L. ECHCG; hemp sesbania, Sesbania exaltata (Raf.) Rydb. Ex A.W. Hill SEBEX; ivyleaf morningglory, Ipomoea hederacea (L.) Jacq. IPOHE; Palmer amaranth S. Wats, Amaranthus palmeri S. Wats AMAPA; pitted morningglory, Ipomoea lacunose L. IPOLA; smellmelon, Cucumis melo L. var. Dudaim Naud CUMME; smooth pigweed, Amaranthus hybridus L., AMACH; Texas panicum, Panicum texanum Buckl. PANTE; yellow nutsedge, Cyperus esculentus L. CYPES; cotton, Gossypium hirsutum L. ‘Deltapine 422BRR’, ‘Deltapine 434RR’, ‘Deltapine 436RR’, ‘Deltapine 555RR’, ‘Stoneville 4892BR’.

W. James Grichar and Brad W. Minton "Using Trifloxysulfuron with Glyphosate for Cotton Weed Control," Weed Technology 21(2), 431-436, (1 April 2007).
Received: 28 March 2006; Accepted: 1 November 2006; Published: 1 April 2007

Crop injury
crop yield
weed efficacy
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