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Evaluating Rates and Application Timings of Saflufenacil for Control of Glyphosate-Resistant Horseweed (Conyza canadenis) Prior to Planting No-Till Cotton

Published online by Cambridge University Press:  20 January 2017

Lucas N. Owen ,
Thomas C. Mueller ,
Christopher L. Main ,
Jason Bond  and
Lawrence E. Steckel
Lucas N. Owen
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
Christopher L. Main
Affiliation:
West Tennessee Research and Education Center, Department of Plant Sciences, University of Tennessee, 605 Airways Boulevard, Jackson, TN 38301
Jason Bond
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 Mississippi State University, Delta Research and Extension Center, P.O. Box 197, Stoneville, MS 38776
*
Corresponding author's E-mail: lsteckel@utk.edu
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Abstract

Managing glyphosate-resistant (GR) horseweed in no-till cotton continues to be a serious challenge for midsouthern producers. Field studies were conducted in 2008 and 2009 to evaluate spring burndown applications of saflufenacil on GR horseweed prior to planting cotton. Saflufenacil controlled GR horseweed at least 94% up to 7 d before planting (DBP) without causing significant cotton injury. Saflufenacil applied at 7 or 14 DBP controlled GR horseweed while still providing residual control until planting. Moreover, saflufenacil, on silt loam soil evaluated in this study, showed no more injury than dicamba applied 7 or more DBP. Results indicated that saflufenacil is an option in cotton for controlling GR horseweed much closer to cotton planting than 42 DBP (current saflufenacil label). At 25 g ha−1, which is the standard labeled rate in cotton, saflufenacil provided > 90% control of GR horseweed. Saflufenacil as a GR horseweed burndown, could replace the current dicamba standard every other year to reduce the probability of horseweed developing resistance to dicamba or salflufenacil.

El manejo de la maleza Conyza canadensis resistente al glifosato en el cultivo de Gossypium hirsutum (algodón) con cero labranza, sigue siendo un serio desafío para los productores de la región media del sur. En 2008 y 2009 se realizaron estudios de campo para evaluar el saflufenacil aplicado en primavera para el control de Conyza canadensis resistente al glifosato antes de la siembra del algodón. El saflufenacil controló Conyza canadensis, al menos en 94% hasta los 7 días antes de la siembra (DBP), sin causar daños significativos al cultivo. El saflufenacil aplicado a los 7 o 14 DBP controló la Conyza canadensis GR, al mismo tiempo que proporcionaba un control residual hasta la siembra. Adicionalmente, el saflufenacil en suelo loam-limoso evaluado en este estudio, no causó más daño que el dicamba aplicado 7 o más días antes de la siembra. Los resultados indican que el saflufenacil es una opción para controlar la Conyza canadensis en el algodón mucho mas cerca de la siembra que los 42 DBP (como indica la recomendación en la etiqueta para este herbicida). A la dosis estándar de 25 g/ha recomendada para el algodón, el saflufenacil proporcionó > 90% de control de la Conyza canadensis GR. El saflufenacil utilizado como un eliminador químico de la Conyza canadensis GR, podría reemplazar al tratamiento estándar con dicamba en años alternos, para reducir la probabilidad de que la maleza desarrolle resistencia al dicamba o al saflufenacil.

Keywords

Horseweed, Conyza canadensis (L.) Cronq. ERICAcotton, Gossypium hirsutum L. Phytogen 485WRFHerbicidepreemergencepreseeding burn-offprotoporphyrinogen oxidase (PPO) inhibitor
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 25 , Issue 1 , March 2011 , pp. 1 - 5
Copyright
Copyright © Weed Science Society of America 

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