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Herbicide Safeners Increase Creeping Bentgrass (Agrostis stolonifera) Tolerance to Pinoxaden and Affect Weed Control

Published online by Cambridge University Press:  23 February 2017

Matthew T. Elmore ,
James T. Brosnan ,
Gregory R. Armel ,
Jose J. Vargas  and
Gregory K. Breeden
Matthew T. Elmore*
Affiliation:
Department of Crop and Soil Sciences, Texas A&M AgriLife, Dallas, TX 75252
James T. Brosnan
Affiliation:
Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996
Gregory R. Armel
Affiliation:
BASF Corp. Research Triangle Park, NC 27709
Jose J. Vargas
Affiliation:
Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996
Gregory K. Breeden
Affiliation:
Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996
*
Corresponding author's E-mail: matthew.elmore@ag.tamu.edu
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Abstract

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The herbicide pinoxaden is a phenylpyrazoline inhibitor of acetyl coenzyme A carboxylase. Research was conducted to determine the effects of pinoxaden (90 g ai ha−1) alone and in combination with herbicide safeners on creeping bentgrass injury as well as perennial ryegrass and roughstalk bluegrass control. Greenhouse experiments determined that herbicide safeners cloquintocet-mexyl, fenchlorazole-ethyl, and mefenpyr-diethyl were more effective in reducing creeping bentgrass injury from pinoxaden than benoxacor, isoxadifen-ethyl, and naphthalic-anhydride. Other experiments determined that creeping bentgrass injury from pinoxaden decreased as rates (0, 23, 45, 68, 90, 225, or 450 g ha−1) of cloquintocet-mexyl, fenchlorazole-ethyl, and mefenpyr-diethyl increased. On the basis of creeping bentgrass responses to various safener rates, safeners were applied at 68 and 450 g ha−1 in additional experiments to evaluate their effects on pinoxaden (90 g ha−1) injury to creeping bentgrass and efficacy against perennial ryegrass and roughstalk bluegrass. In these experiments, safeners mefenpyr-diethyl and cloquintocet-mexyl reduced pinoxaden-induced creeping bentgrass injury (from 25 to ≤ 5%) more than fenchlorazole-ethyl at 2 wk after treatment. Safeners reduced pinoxaden efficacy against roughstalk bluegrass. Perennial ryegrass was controlled > 80% by pinoxaden and herbicide safeners did not reduce control. Field experiments should evaluate pinoxaden in combination with cloquintocet-mexyl and mefenpyr-diethyl to optimize safener : herbicide ratios and rates for creeping bentgrass safety as well as perennial ryegrass and roughtstalk bluegrass control in different climates and seasons.

El herbicida pinoxaden es una inhibidor phenylpyrazoline de la encima acetyl coenzyme A carboxylase. Se realizó una investigación para determinar los efectos de pinoxaden (90 g ai ha−1) solo o en combinación con antídotos de herbicidas sobre el daño en el césped Agrostis stolonifera además del control de Lolium perenne y Poa trivialis. Los experimentos de invernadero determinaron que los antídotos cloquintocet-mexyl, fenchlorazole-ethyl, y mefenpyr-diethyl fueron más efectivos en reducir el daño en A. stolonifera causado por pinoxaden que benoxacor, isoxadifen-ethyl, y naphthalic-anhydride. Otros experimentos determinaron que el daño en A. stolonifera causado por pinoxaden disminuyó al aumentar las dosis (0, 23, 45, 68, 90, 225, ó 450 g ha−1) de cloquintocet-mexyl, fenchlorazole-ethyl, y mefenpyr-diethyl. Con base en las respuesta de A. stolonifera a varias dosis de antídotos, se aplicaron antídotos a 68 y 450 g ha−1 en experimentos adicionales para evaluar sus efectos en el daño por pinoxaden (90 g ha−1) en A. stolonifera y la eficacia contra L. perenne y P. trivialis. En estos experimentos los antídotos mefenpyr-diethyl y cloquintocet-mexyl redujeron el daño inducido por pinoxaden en A. stolonifera (de 25 a ≤ 5%) más que fenchlorazole-ethyl a 2 semanas después del tratamiento. Los antídotos redujeron la eficacia de pinoxaden para el control de P. trivialis. Sin embargo, L. perenne fue controlado >80% con pinoxaden y los antídotos no redujeron el control. Experimentos de campo deberían evaluar pinoxaden en combinación con cloquintocet-mexyl y mefenpyr-diethyl para optimizar la proporción de antídoto:herbicida y las dosis para la seguridad en A. stolonifera además del control de L. perenne y P. trivialis en diferentes climas y temporadas.

Keywords

Cloquintocet-mexylfenchlorazole-ethylmefenpyr-diethylpinoxadencreeping bentgrass, Agrostis stolonifera L. AGSSTperennial ryegrass, Lolium perenne L. LOLPEroughstalk bluegrass, Poa trivialis L. POATRAcetyl coenzyme A carboxylaseACCasegraminicidephenylpyrazolinesafenerturfgrass
Type
Research Article
Information
Weed Technology , Volume 30 , Issue 4 , December 2016 , pp. 919 - 928
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © Weed Science Society of America

Footnotes

Associate Editor for this paper: Scott McElroy, Auburn University.

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