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Comparison of Trifloxysulfuron and Pyrithiobac in Glyphosate-Resistant and Bromoxynil-Resistant Cotton

Published online by Cambridge University Press:  20 January 2017

Jeffrey W. Branson ,
Kenneth L. Smith  and
James L. Barrentine
Jeffrey W. Branson*
Affiliation:
University of Arkansas, Stuttgart, AR 72160
Kenneth L. Smith
Affiliation:
Southeast Research and Extension Center, Monticello, AR 71655
James L. Barrentine
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72704
*
Corresponding author's E-mail: jbranson@uaex.edu
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Abstract

Field studies were conducted in 2000 and 2001 at Rohwer, AR. Trifloxysulfuron (5.3 and 8 g ai/ha) and pyrithiobac (70 g ai/ha) were applied preemergence (PRE) and postemergence (POST) broadcast at the two- to three-leaf (EP) and three- to four-leaf (MP) cotton growth stages. Both materials were also applied POST in combination with glyphosate at 560 g ae/ha or bromoxynil at 560 g ai/ha at both growth stages. Trifloxysulfuron applied EP or MP at 8 g/ha provided greater control of sicklepod and pitted morningglory 28 d after application (DAA) than trifloxysulfuron at 5.3 g/ha or pyrithiobac at 70 g/ha; however, control of prickly sida was greater with pyrithiobac than with trifloxysulfuron at either rate. Glyphosate alone controlled sicklepod, prickly sida, and pitted morningglory greater than 80%. The addition of trifloxysulfuron at 8 g/ha and pyrithiobac at 70 g/ ha increased control of all species over glyphosate alone 28 DAA. Bromoxynil at 560 g/ha controlled pitted morningglory and hemp sesbania at all application timings; however, sicklepod and Palmer amaranth control was less than 50% with bromoxynil applied alone. When bromoxynil was applied in combination with trifloxysulfuron at either rate, control of sicklepod and Palmer amaranth increased to 80% or greater at all application timings. Trifloxysulfuron has the potential to complement both the glyphosate-resistant and bromoxynil-resistant weed control programs by providing control of less susceptible weeds and by providing residual control to both programs.

Keywords

Bromoxynilglyphosatepyrithiobactrifloxysulfuronhemp sesbania, Sesbania exaltata (Raf.) Rybd. ex A.W. Hill # SEBEXPalmer amaranth, Amaranthus palmeri S. Wats. # AMAPApitted morningglory, Ipomoea lacunosa L. # IPOLAprickly sida, Sida spinosa L. # SIDSPsicklepod, Senna obtusifolia L. # CASOBcotton, Gossypium hirsutum L. # GOSHIApplication timingsbromoxynil-resistant cottonglyphosateglyphosate-resistant cottonresidual herbicidestransgenic cottontrifloxysulfuron sodiumBXN, bromoxynil-resistantDAA, days after applicationEP, early postemergenceMP, mid-postemergencePOST, postemergence over-the-topPRE, preemergence
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 2 , June 2005 , pp. 404 - 410
Copyright
Copyright © Weed Science Society of America 

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