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Postemergence Tropical Signalgrass (Urochloa subquadripara) Control with Nonorganic Arsenical Herbicides

Published online by Cambridge University Press:  20 January 2017

Robert B. Cross ,
Lambert B. McCarty  and
Alan G. Estes
Robert B. Cross
Affiliation:
Department of Agricultural and Environmental Sciences, E-143 Poole Agriculture Center, Clemson University, Clemson, SC 29634
Lambert B. McCarty*
Affiliation:
Department of Agricultural and Environmental Sciences, E-143 Poole Agriculture Center, Clemson University, Clemson, SC 29634
Alan G. Estes
Affiliation:
PBI-Gordon Corporation, Kansas City, MO 64101
*
∗Corresponding author's E-mail: [email protected]
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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.

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.

Keywords

Amicarbazonedicambaforamsulfuronhalosulfuronimazethapyriodosulfuronmetribuzinquincloracsulfentrazonethiencarbazonebermudagrass, Cynodon dactylon (L.) Perstropical signalgrass, Urochloa subquadripara (Trin.) R.D. WebsterHerbicide resistanceorganic arsenical herbicidesturfgrass
Type
Research Article
Information
Weed Technology , Volume 30 , Issue 3 , September 2016 , pp. 815 - 821
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate Editor for this paper: Patrick E. McCullough.

References

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