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Program Approaches to Control Herbicide-Resistant Barnyardgrass (Echinochloa crus-galli) in Midsouthern United States Rice

Published online by Cambridge University Press:  20 January 2017

Michael J. Wilson ,
Jason K. Norsworthy ,
Robert C. Scott  and
Edward E. Gbur
Michael J. Wilson
Affiliation:
University of Arkansas, Department of Crop, Soil, and Environmental Sciences, 1366 West Altheimer Drive, Fayetteville, AR 72704
Jason K. Norsworthy*
Affiliation:
University of Arkansas, Department of Crop, Soil, and Environmental Sciences, 1366 West Altheimer Drive, Fayetteville, AR 72704
Robert C. Scott
Affiliation:
University of Arkansas, Department of Crop, Soil, and Environmental Sciences, 1366 West Altheimer Drive, Fayetteville, AR 72704
Edward E. Gbur
Affiliation:
Agricultural Statistics Laboratory, University of Arkansas, 101 Agricultural Annex Building, Fayetteville, AR 72701
*
Corresponding author's E-mail: jnorswor@uark.edu.
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Abstract

The goal of this research was to develop herbicide programs for controlling acetolactate synthase (ALS)–, propanil-, quinclorac-, and clomazone-resistant barnyardgrass. Two applications of imazethapyr alone at 70 g ai ha−1 failed to control the ALS-resistant biotype more than 36%; however, when imazethapyr at 70 g ha−1 was applied early POST (EPOST) followed by imazethapyr at 70 g ha−1 plus fenoxaprop at 120 g ai ha−1 immediately prior to flooding (PREFLD), barnyardgrass control improved to 78% at 10 wk after planting. When imazethapyr was applied twice following PRE or delayed PRE applications of clomazone at 336 g ai ha−1, quinclorac at 560 g ai ha−1, pendimethalin at 1,120 g ai ha−1, or thiobencarb at 4,480 g ai ha−1 control was 92 to 100%. A single-pass program consisting of a delayed PRE application of clomazone at 336 g ha−1 plus quinclorac at 560 g ha−1 plus pendimethalin at 1,120 g ha−1 plus thiobencarb at 4,480 g ha−1 controlled all herbicide-resistant barnyardgrass biotypes at the same level as a standard multiple application program.

El objetivo de esta investigación fue desarrollar programas de herbicidas para el control de Echinochloa crus-galli resistente a acetolactate synthase (ALS), propanil, quinclorac, y clomazone. Dos aplicaciones de imazethapyr solo a 70 g ai ha−1 fallaron en controlar en más de 36% el biotipo resistente a ALS. Sin embargo, cuando se aplicó imazethapyr POST temprano (EPOST) a 70 g ha−1 seguido de imazethapyr a 70 g ha−1 más fenoxaprop a 120 g ai ha−1 inmediatamente antes de la inundación (PREFLD), el control de E. crus-galli mejoró a 78% a 10 semanas después de la siembra. Cuando se aplicó imazethapyr dos veces después de aplicaciones PRE o PRE retrasadas de clomazone a 336 g ai ha−1, quinclorac a 560 g ai ha−1, pendimethalin a 1,120 g ai ha−1, o thiobencarb a 4,480 g ai ha−1, el control fue 92 a 100%. Un programa de un solo pase consistiendo de una aplicación PRE retrasada de clomazone a 336 g ha−1 más quinclorac a 560 g ha−1 más pendimethalin a 1,120 g ha−1 más thiobencarb a 4,480 g ha−1 controló todos los biotipos de E. crus-galli resistente a herbicidas al mismo nivel que el programa estándar de aplicaciones múltiples.

Keywords

Clomazonefenoxapropimazethapyrpendimethalinpropanilquincloracthiobencarbbarnyardgrass, Echinochloa crus-galli (L.) Beauvrice, Oryza sativa L. ‘CL151’Herbicide-resistant weedsmultiple resistanceweed control
Type
Research Article
Information
Weed Technology , Volume 28 , Issue 1 , March 2014 , pp. 39 - 46
Copyright
Copyright © Weed Science Society of America 

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References

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