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1 August 2015 Postemergence Tropical Signalgrass (Urochloa subquadripara) Control with Nonorganic Arsenical Herbicides
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Abstract

Tropical signalgrass (TSG) has become a serious weed problem in tropical and subtropical regions such as Florida in recent years in association with the ban of organic arsenical herbicide use in turf. The purpose of this research was to identify alternative POST herbicides that control TSG. Two field experiments were conducted in bermudagrass golf course fairways in south and central Florida in 2014 and 2015. Several nonorganic arsenical herbicide treatments controlled TSG. In the first experiment, treatments containing amicarbazone alone and in combination with other herbicides provided > 97% TSG control 12 wk after initial treatment (WAIT) in 2014 and 2015. These included a single application of amicarbazone at 0.49 kg ai ha−1, or sequential applications of amicarbazone at 0.25 kg ha−1 in combination with foramsulfuron at 0.04 kg ai ha−1, sulfentrazone imazethapyr at 0.25 kg ai ha−1, thiencarbazone foramsulfuron halosulfuron at 0.14 kg ai ha−1, and thiencarbazone iodosulfuron dicamba at 0.18 kg ai/ae ha−1. In the second experiment, sequential applications of thiencarbazone foramsulfuron halosulfuron at 0.14 kg ha−1 in combination with either quinclorac at 0.84 kg ai ha−1 or metribuzin at 0.28 kg ai ha−1 provided ≥ 85% TSG control 12 WAIT in both years.

Nomenclature: Amicarbazone; dicamba; foramsulfuron; halosulfuron; imazethapyr; iodosulfuron; metribuzin; quinclorac; sulfentrazone; thiencarbazone; bermudagrass, Cynodon dactylon (L.) Pers.; tropical signalgrass, Urochloa subquadripara (Trin.) R.D. Webster.

En años recientes, Urochloa subquadripara (TSG) se ha convertido en un problema serio de malezas en regiones tropicales y subtropicales, como Florida, en asociación con la prohibición de uso de herbicidas de arsénico orgánico en céspedes. El objetivo de esta investigación fue identificar alternativas de herbicidas POST que controlen TSG. Se realizaron dos experimentos de campo en fairways de campos de golf con césped bermuda en el sur y centro de Florida en 2014 y 2015. Varios tratamientos con herbicidas con arsénico no-orgánico controlaron TSG. En el primer experimento, los tratamientos que contenían amicarbazone solo o en combinación con otros herbicidas brindaron > 97% de control de TSG 12 semanas después del tratamiento inicial (WAIT) en 2014 y 2015. Estos incluyeron una sola aplicación de amicarbazone a 0.49 kg ai ha−1, o aplicaciones secuenciales de amicarbazone a 0.25 kg ha−1 en combinación con foramsulfuron a 0.04 kg ai ha−1, sulfentrazone imazethapyr a 0.25 kg ai ha−1, thiencarbazone foramsulfuron halosulfuron a 0.14 kg ai ha−1, y thiencarbazone iodosulfuron dicamba a 0.18 kg ai/ae ha−1. En el segundo experimento, aplicaciones secuenciales de thiencarbazone foramsulfuron halosulfuron a 0.14 kg ha−1 en combinación con quinclorac a 0.84 kg ai ha−1 o metribuzin a 0.28 kg ai ha−1 brindaron ≥ 85% de control de TSG 12 WAIT en ambos años.

Robert B. Cross, LAMBERT B. McCARTY, and Alan G. Estes "Postemergence Tropical Signalgrass (Urochloa subquadripara) Control with Nonorganic Arsenical Herbicides," Weed Technology 30(3), (1 August 2015). https://doi.org/10.1614/WT-D-16-00012.1
Received: 21 January 2016; Accepted: 1 April 2016; Published: 1 August 2015
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