Response of LibertyLink and WideStrike Cotton to Varying Rates of Glufosinate

Dodds, Darrin M.; Main, Christopher L.; Barber, L. T.; Burmester, C. H.; Collins, Guy; Edmisten, Keith L.; StephensonIV, Daniel O.; Whitaker, Jared R.; Boykin, Debbie

doi:10.1614/wt-d-15-00012.1

Cited by 6 publications

(14 citation statements)

References 22 publications

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“…typical use rate when applied once or twice at growth stages ranging from 2-to 12-leaf. Resistance was similar to that described in previous research with LibertyLink and GlyTol + LibertyLink cotton (Dodds et al 2015;Irby et al 2013;Sweeney and Jones 2014;Wallace et al 2011). In other work (Richburg et al 2015; Dow AgroSciences internal research reports, unpublished data), Enlist cotton has been shown to be very tolerant to 2,4-D applied topically.…”

Section: Resultssupporting

confidence: 88%

Resistance of Enlist^™(AAD-12) Cotton to Glufosinate

Braxton¹,

Richburg²,

York³

et al. 2017

Weed Technol

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Release of InformationDow AgroSciences LLC (DAS) is submitting the information in this petition for deregulation to USDA-APHIS as part of the regulatory process. By submitting this information, DAS does not authorize its release to any third party. If USDA receives a Freedom of Information Act request pursuant to 5 U.S.C., § 552 and 7 CFR Part 1 regarding this information, DAS expects that USDA will provide DAS with a copy of the material proposed to be released and the opportunity to object to the release of any information based on appropriate legal grounds (e.g., responsiveness, confidentiality, and/or competitive concerns). DAS understands that a copy of this information may be made available to the public in a reading room and upon individual request as part of a public comment period. Except in accordance with the foregoing, DAS does not authorize the release, publication or other distribution of this information (including website posting) without prior notice and consent from DAS.© 2013 Dow AgroSciences LLC. All Rights Reserved. This document is property of Dow AgroSciences LLC and is for use by the regulatory authority to which it has been submitted, and only in support of actions requested by Dow AgroSciences. All data and information herein must not be used, reproduced or disclosed to third parties for any other purpose without the written consent of Dow AgroSciences. USDA-APHIS Petition for Nonregulated Status of DAS-8191Ø-7 CottonPage 3 of 214 Dow AgroSciences LLC CertificationThe undersigned certifies that, to the best knowledge and belief of the undersigned, this petition includes all information and views on which to base a determination and that it includes all relevant data and information known to the petitioner, unfavorable as well as favorable, associated with DAS-8191Ø-7 cotton. SummaryDow AgroSciences LLC (herein referred to as "DAS") is submitting a Petition for Determination of Nonregulated Status for DAS-8191Ø-7 cotton. DAS requests from USDA Animal and Plant Health Inspection Service (APHIS) that cotton transformation event DAS-8191Ø-7 and any cotton lines derived from crosses between DAS-8191Ø-7 cotton and conventional cotton or biotechnology-derived cotton granted nonregulated status by APHIS, no longer be considered regulated articles under 7 CFR Part 340.DAS has developed transgenic cotton plants containing aad-12 and pat, which confer tolerance to the herbicides 2,4-dichlorophenoxyacetic acid (2,4-D) and glufosinate. DAS-8191Ø-7 cotton will provide growers with greater flexibility in selection of herbicides for the improved control of economically important weeds; allow an increased application window for effective weed control; and provide an effective weed resistance management solution to the growing incidence of glyphosate resistant weeds.DAS-8191Ø-7 cotton plants have been genetically modified to express aryloxyalkanoate dioxygenase-12 (AAD-12). AAD-12 is an enzyme with an alpha ketoglutarate-dependent dioxygenase activity which results in metabolic inactivation of the herbi...

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Section: Resultssupporting

confidence: 88%

Resistance of Enlist^™(AAD-12) Cotton to Glufosinate

Braxton¹,

Richburg²,

York³

et al. 2017

Weed Technol

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“…The results of this study support previous research that WideStrike cotton is more sensitive to postemergence applications of glufosinate, compared to other cotton cultivars such as LibertyLink (Marten and Jordan 1979). Additionally, this study supports previous research that tank mixtures of S-metolachlor with glufosinate can result in greater injury than glufosinate applied alone (Dodds et al 2015). According to this research, nozzle type does not have a significant effect on visible crop injury when comparing identical treatments within cultivars in most comparisons.…”

Section: Seed Cotton Yieldsupporting

confidence: 87%

“…A 110015 Turbo TeeJet Induction (TTI)® nozzle (TeeJet Technologies, Glendale Heights, IL) induction nozzle producing ultra-coarse droplets, or an 110015 extended-range (XR) flatfan nozzle (TeeJet Technologies, Glendale Heights, IL) producing fine droplets were used to apply to four-leaf and eight-leaf cotton. The trial was maintained weed free through methods similar to Dodds et al (2015) by the use of preemergence herbicides and hand weeding. The center two rows of each four-row plot were harvested using a spindle picker modified for small-plot harvesting.…”

Section: Methodsmentioning

confidence: 99%

“…One to two postemergence applications of glufosinate to WideStrike cotton have been documented to cause visible plant injury ranging from 5% to 25% without having a negative effect on yield (Culpepper et al 2009;Dodds et al 2015;Whitaker et al 2011a). Three applications of glufosinate to WideStrike cotton, however, have been shown to reduce yield up to 7% (Barnett et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…The glufosinate rate applied influences the degree of visible cotton injury as well as yield, with rates higher than the standard 0.6 kg ha -1 tending to cause more injury. Glufosinate applied at 1.2 kg ha -1 to WideStrike cotton has proved to delay plant maturity as well as reduce cotton yield (Dodds et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Cotton cultivar response to glufosinate plus S-metolachlor applied postemergence using two nozzle types

et al. 2021

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Field studies were conducted in Alabama in 2016 and 2017 to determine the effect of postemergence applications of glufosinate alone and glufosinate applied with S-metolachlor, using two different nozzle types, on LibertyLink®, XtendFlex®, and WideStrike® cotton growth and yield. Two applications of glufosinate at 0.6 kg ha−1, and glufosinate with S-metolachlor at 1.39 kg ha−1 were applied to each cotton cultivar at the four-leaf and eight-leaf growth stages using a flatfan and Turbo TeeJet Induction® nozzle. Visual estimates of cotton injury were evaluated after each application, as well as yield. No differences in yield, within each cotton cultivar were observed for either year. Visual injury was higher for WideStrike cotton than LibertyLink or XtendFlex cultivars. On average, glufosinate applied with S-metolachlor resulted in higher injury than glufosinate applied alone. In LibertyLink cotton, applications made with TTI nozzles resulted in greater injury than flatfan nozzles. However, cotton injury was transient and did not affect cotton yields. These data indicate that applications of glufosinate and glufosinate applied with S-metolachlor, at 0.6 kg ha−1 and 1.39 kg ha−1, respectively, with either a flatfan or TTI nozzle, can have no detrimental effect on cotton growth or yield.

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Injury potential of herbicide combinations on XtendFlex® cotton

et al. 2021

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XtendFlex® technology from Bayer allows growers to apply glyphosate, glufosinate, and dicamba POST to cotton. Since the evolution and spread of glyphosate-resistant weed species, early POST applications with several modes of action have become common. However, crop injury potential from these applications warrants further examination. Field studies were conducted from 2015 to 2017 at two locations in Mississippi to evaluate XtendFlex® cotton injury from herbicide application. Herbicide applications were made to XtendFlex® cotton at the 3 to 6 leaf stage with herbicide combinations comprised of two, three, and four-way combinations of glyphosate, glufosinate, S-metolachlor, and three formulations of dicamba. Data collection included visual estimations of injury, stand counts, cotton height, total mainstem nodes, and nodes above whiteflower at first bloom. Data collection at the end of the season included cotton height, total mainstem nodes, and nodes above cracked boll. Visual estimations of injury from herbicide applications were highest at 3 days following applications containing glufosinate + S-metolachlor (36 to 41% injury) and glufosinate + S-metolachlor in combination with dicamba + glyphosate (39 to 41% injury), regardless of the dicamba formulation. Crop injury decreased at each rating interval and dissipated by 28 days following applications (p = 0.3748). Height reductions were present at first bloom and at the end of the season (p < 0.0001), although cotton yield was unaffected (p = 0.2089) even when injury at 3 days after treatment (DAA) was greater than 30%. Results indicate that growers may apply a variety of herbicide tank-mixtures to XtendFlex® cotton and expect no yield penalty. Furthermore, if growers are concerned with cotton injury after herbicide applications, the use of glufosinate in combination with S-metolachlor should be approached with caution in XtendFlex® cotton.

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Response of LibertyLink and WideStrike Cotton to Varying Rates of Glufosinate

Cited by 6 publications

References 22 publications

Resistance of Enlist^™(AAD-12) Cotton to Glufosinate

Resistance of Enlist^™(AAD-12) Cotton to Glufosinate

Cotton cultivar response to glufosinate plus S-metolachlor applied postemergence using two nozzle types

Injury potential of herbicide combinations on XtendFlex® cotton

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Response of LibertyLink and WideStrike Cotton to Varying Rates of Glufosinate

Cited by 6 publications

References 22 publications

Resistance of Enlist™(AAD-12) Cotton to Glufosinate

Resistance of Enlist™(AAD-12) Cotton to Glufosinate

Cotton cultivar response to glufosinate plus S-metolachlor applied postemergence using two nozzle types

Injury potential of herbicide combinations on XtendFlex® cotton

Contact Info

Product

Resources

About

Resistance of Enlist^™(AAD-12) Cotton to Glufosinate

Resistance of Enlist^™(AAD-12) Cotton to Glufosinate