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Interval between sequential glufosinate applications influences weed control in cotton

Published online by Cambridge University Press:  31 January 2020

Taylor M. Randell Open the ORCID record for Taylor M. Randell [Opens in a new window] ,
Lavesta C. Hand ,
Jenna C. Vance  and
A. Stanley Culpepper
Taylor M. Randell*
Affiliation:
Graduate Research Assistant, Department of Crop and Soil Science, University of Georgia, Tifton, GA, USA
Lavesta C. Hand
Affiliation:
Graduate Research Assistant, Department of Crop and Soil Science, University of Georgia, Tifton, GA, USA
Jenna C. Vance
Affiliation:
Research Professional, Department of Crop and Soil Science, University of Georgia, Tifton, GA, USA
A. Stanley Culpepper
Affiliation:
Professor, Department of Crop and Soil Science, University of Georgia, Tifton, GA, USA
*
Author for correspondence: Taylor M. Randell, Department of Crop and Soil Science, University of Georgia, 2356 Rainwater Road, Tifton, GA31794. (Email: trandell@uga.edu)
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Abstract

Dicamba and 2,4-D systems control many problematic weeds; however, drift to susceptible crops can be a concern in diverse production areas. Glufosinate-based systems are an alternative, but current recommended rates of glufosinate can result in variable control. Research was conducted in 2017 and 2018 to investigate the optimum time interval between sequential glufosinate applications and determine if the addition of glyphosate with glufosinate is beneficial for controlling Palmer amaranth and annual grasses in cotton. The interval between sequential applications (1, 3, 5, 7, 10, or 14 d or no second spray) was the whole plot and herbicide option (glufosinate or glufosinate plus glyphosate) was the subplot. Combined over herbicides, Palmer amaranth 15- to 20-cm tall (at four locations) was controlled 98% to 99% with sequential intervals of 1 to 7 d compared with 70% to 88% with intervals of 10 or 14 d. Lowest biomass weight and population densities were noted with 1- to 7-d intervals. Large crabgrass 15- to 20-cm tall (at five locations) was controlled 93% to 98% with glufosinate applications 3- to 7-d apart as compared with 76% to 81% with applications 10- to 14-d apart. Lowest biomass weights were observed with 1- to 7-d intervals. When glufosinate controlled grass less than 93%, adding glyphosate was beneficial. Neither interval between sequential applications nor herbicide option influenced cotton yield. Shorter time intervals between sequential application and including glyphosate can improve the effectiveness of a glufosinate-based system in managing Palmer amaranth and large crabgrass.

Keywords

Auxin alternativecotton weed controlglufosinate-based systeminterval between herbicide applications2,4-Ddicambaglyphosateglufosinatelarge crabgrass, Digitaria sanguinalis (L.) ScopPalmer amaranth, Amaranthus palmeri S. Watsoncotton, Gossypium hirsutum L. ‘DP 1646 B2XF’, ‘PHY 430 W3FE’
Type
Research Article
Information
Weed Technology , Volume 34 , Issue 4 , August 2020 , pp. 528 - 533
Copyright
© Weed Science Society of America, 2020

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Footnotes

Associate Editor: Daniel Stephenson, Louisana State University Agricultural Center

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