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Glyphosate-Resistant Giant Ragweed (Ambrosia trifida) Control in WideStrike® Flex Cotton

Published online by Cambridge University Press:  20 January 2017

Kelly A. Barnett ,
Thomas C. Mueller  and
Lawrence E. Steckel
Kelly A. Barnett*
Affiliation:
University of Tennessee, Department of Plant Sciences, 605 Airways Boulevard, Jackson, TN 38301
Thomas C. Mueller
Affiliation:
University of Tennessee, Department of Plant Sciences, 252 Ellington Plant Sciences Building, 2431 Joe Johnson Drive, Knoxville, TN 37996
Lawrence E. Steckel
Affiliation:
University of Tennessee, Department of Plant Sciences, 605 Airways Boulevard, Jackson, TN 38301
*
Corresponding author's E-mail: kbarnet7@utk.edu
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Abstract

A field study was conducted in 2009, 2010, and 2011 on a grower's field with a known population of glyphosate-resistant giant ragweed to determine potential control options utilizing a WideStrike® cotton variety. Glyphosate-resistant giant ragweed control and cotton response to herbicide applications were both assessed. Few herbicide treatments provided greater than 80% control. Glufosinate followed by glufosinate was the only treatment that provided greater than 90% control at each assessment timing. Other effective treatments were glufosinate alone, glufosinate plus glyphosate, glyphosate plus pyrithiobac, and glufosinate plus fluometuron. Results from this study indicate that few of the studied herbicide treatments provide effective control of glyphosate-resistant giant ragweed without reducing yield in WideStrike cotton. Treatments that had the highest level of giant ragweed control at all ratings and also had the highest yield included glufosinate followed by glufosinate, glufosinate plus pyrithiobac, and glufosinate plus fluometuron at either rate. However, glufosinate followed by glufosinate was the only treatment that resulted in greater than 90% control of giant ragweed without reducing crop yield.

Se realizõ un estudio de campo en 2009, 2010 y 2011 en el campo de un productor que tenĩa una poblaciõn de Ambrosia trifida resistente a glyphosate, para determinar opciones potenciales de control utilizando una variedad WideStrike® de algodõn. Se evaluõ el control de A. trifida resistente a glyphosate y la respuesta del algodõn a aplicaciones de herbicidas. Pocos tratamientos con herbicidas brindaron un control superior al 80%. Glufosinate seguido de glufosinate fue el ũnico tratamiento que brindõ un control superior al 90% en cada momento de evaluaciõn. Otros tratamientos efectivos fueron glufosinate solo, glufosinate más glyphosate, glyphosate más pyrithiobac, y glufosinate más fluometuron. Los resultados de este estudio indican que pocos de los tratamientos con herbicidas estudiados proveen un control efectivo de A. trifida resistente a glyphosate sin reducir el rendimiento del algodõn WideStrike. Los tratamientos que tuvieron los mayores niveles de control de A. trifida en todas las evaluaciones y además tuvieron los mayores rendimientos incluyeron: glufosinate seguido de glufosinate, glufosinate más pyrithiobac y glufosinate más fluometuron en cada dosis. Sin embargo, glufosinate seguido de glufosinate fue el ũnico tratamiento que resultõ en un control de A. trifida superior al 90% sin reducir el rendimiento del cultivo.

Keywords

Fluometuronglufosinateglyphosatepyrithiobacgiant ragweed, Ambrosia trifida L.cotton, Gossypium hirsutum L.Glyphosate resistanceherbicide resistance
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 26 , Issue 4 , December 2012 , pp. 611 - 616
Copyright
Copyright © Weed Science Society of America 

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