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Resistance Profile of Diclofop-Resistant Italian Ryegrass (Lolium multiflorum) to ACCase- and ALS-Inhibiting Herbicides in Arkansas, USA

Published online by Cambridge University Press:  20 January 2017

Yong In Kuk ,
Nilda R. Burgos  and
Robert C. Scott
Yong In Kuk
Affiliation:
Department of Bioresource Science, College of Life and Natural Resources, Sunchon National University, Jeonnam, South Korea, 540-742
Nilda R. Burgos*
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
Robert C. Scott
Affiliation:
Arkansas Cooperative Extension Service, P.O. Box 357, Lonoke, AR 72086
*
Corresponding author's E-mail: nburgos@uark.edu
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Abstract

Diclofop-resistant Italian ryegrass is a major weed problem in wheat production. This study aimed to determine the resistance pattern of diclofop-resistant Italian ryegrass accessions from the southern United States to the latest commercialized herbicides for wheat production, pinoxaden and mesosulfuron, and to other acetolactate synthase (ALS) and acetyl-CoA carboxylase (ACCase) inhibitors. Twenty-nine of 36 accessions were resistant to the commercial dose of diclofop. The majority (80%) of diclofop-resistant accessions were also resistant to clodinafop. Of 25 diclofop-resistant accessions, 5 were resistant to pinoxaden. All accessions tested were susceptible to the commercial dose of clethodim and sethoxydim. The cross-resistance pattern of diclofop-resistant Italian ryegrass to other ACCase inhibitors was 20% for pinoxaden and none with clethodim or sethoxydim. One accession was resistant to mesosulfuron but not to diclofop. This mesosulfuron-resistant accession was cross-resistant to sulfometuron but not to imazamox. All diclofop-resistant accessions tested were susceptible to ALS inhibitors, mesosulfuron, sulfometuron, and imazamox. Therefore, diclofop-resistant Italian ryegrass in Arkansas can be controlled with imazamox (in Clearfield wheat) and can mostly be controlled with mesosulfuron and pinoxaden. It could also be controlled by other selective grass herbicides in broadleaf crops.

Keywords

ClethodimclodinafopdiclofopimazamoxmesosulfuronpinoxadensethoxydimsulfometuronItalian ryegrass, Lolium multiflorum Lam., wheat, Triticum aestivum LAcetolactate synthase (ALS)acetyl-CoA carboxylase (ACCase)cross-resistancemultiple resistance
Type
Weed Management
Information
Weed Science , Volume 56 , Issue 4 , August 2008 , pp. 614 - 623
Copyright
Copyright © Weed Science Society of America 

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