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Evaluation of Spring and Fall Burndown Application Timings on Control of Glyphosate-Resistant Horseweed (Conyza canadensis) in No-Till Cotton

Published online by Cambridge University Press:  20 January 2017

Lucas N. Owen
Affiliation:
West Tennessee Research and Education Center, Department of Plant Sciences, University of Tennessee, 605 Airways Boulevard, Jackson, TN 38301
Lawrence E. Steckel*
Affiliation:
West Tennessee Research and Education Center, Department of Plant Sciences, University of Tennessee, 605 Airways Boulevard, Jackson, TN 38301
Cliford H. Koger
Affiliation:
Delta Research and Education Center, Mississippi State University, 82 Stoneville Road, P.O. Box 197, Stoneville, MS 38776
Christopher L. Main
Affiliation:
West Tennessee Research and Education Center, Department of Plant Sciences, University of Tennessee, 605 Airways Boulevard, Jackson, TN 38301
Thomas C. Mueller
Affiliation:
Department of Plant Sciences, University of Tennessee, 2431 Joe Johnson Drive, Knoxville, TN 37920
*
Corresponding author's E-mail: lsteckel@utk.edu.

Abstract

Field studies were conducted in 2007 and 2008 to evaluate fall applications of herbicides to control glyphosate-resistant (GR) horseweed before planting cotton. Fall treatments were compared with spring treatments for control of GR horseweed and effect on seed cotton yield. Fall and spring treatments with and without residual herbicides were also compared. No differences were observed for control of GR horseweed or seed cotton yield between fall and spring application timings. However, a difference was observed between fall applications with and without a residual herbicide. Fall applications that contained residual herbicides provided 86% control of GR horseweed and yielded 2,360 kg/ha of seed cotton. Fall applications that did not contain a residual herbicide only provided 70% control of GR horseweed and yielded 2,010 kg/ha of seed cotton. No benefit was observed from spring applications that contained a residual herbicide. This research indicates that glyphosate-resistant horseweed can be controlled with fall- or spring-applied burndown herbicides, and fall applications should include a residual herbicide for best results.

Type
Weed Management—Major Crops
Copyright
Copyright © Weed Science Society of America 

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