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1 January 2014 Program Approaches to Control Herbicide-Resistant Barnyardgrass (Echinochloa crus-galli) in Midsouthern United States Rice
Michael J. Wilson, Jason K. Norsworthy, Robert C. Scott, Edward E. Gbur
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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.

Nomenclature: Clomazone; fenoxaprop; imazethapyr; pendimethalin; propanil; quinclorac; thiobencarb; barnyardgrass, Echinochloa crus-galli (L.) Beauv; rice, Oryza sativa L. ‘CL151’.

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.

Michael J. Wilson, Jason K. Norsworthy, Robert C. Scott, and Edward E. Gbur "Program Approaches to Control Herbicide-Resistant Barnyardgrass (Echinochloa crus-galli) in Midsouthern United States Rice," Weed Technology 28(1), 39-46, (1 January 2014). https://doi.org/10.1614/WT-D-13-00062.1
Received: 12 April 2013; Accepted: 1 August 2013; Published: 1 January 2014
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