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Selective Postemergence Herbicide Control of Torpedograss in Centipedegrass

Published online by Cambridge University Press:  20 January 2017

James Taverner ,
Jeffrey S. Beasley ,
Ronald E. Strahan ,
James L. Griffin  and
Steven M. Borst
James Taverner
Affiliation:
School of Plant Environmental and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803
Jeffrey S. Beasley
Affiliation:
School of Plant Environmental and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803
Ronald E. Strahan*
Affiliation:
School of Plant Environmental and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803
James L. Griffin
Affiliation:
School of Plant Environmental and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803
Steven M. Borst
Affiliation:
School of Plant Environmental and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803
*
Corresponding author's E-mail: RStrahan@agcenter.lsu.edu.
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Abstract

Torpedograss infestation in centipedegrass has reduced centipedegrass quality in home lawns along the Gulf Coast. This study was conducted to evaluate three selective postemergence herbicides. Field trials were conducted at two sites in Louisiana to evaluate quinclorac, sethoxydim, and clethodim applied once or sequentially every 4 wk for selective torpedograss control in centipedegrass turf. Herbicides were applied to mixed stands of torpedograss/centipedegrass at two locations in Louisiana and evaluated for changes in torpedograss coverage and centipedegrass injury every 2 wk for 16 wk. All herbicides controlled torpedograss more with each sequential application. Sethoxydim and clethodim applied three times reduced torpedograss cover 84 and 87%, respectively, and more than quinclorac 12 wk after initial treatment (WAIT). Increasing clethodim or sethoxydim rates did not improve torpedograss control. Torpedograss regrowth occurred within weeks after final herbicide applications regardless of herbicide. Only multiple clethodim applied at twice manufacturer's labeled rate or quinclorac applications resulted in commercially unacceptable (> 25%) injury to centipedegrass. Multiple sethoxydim or clethodim applications at 0.32 kg ha−1 or 0.30 kg ha−1 every 4 wk reduced torpedograss competitiveness in centipedegrass; however, multiple applications for more than 1 yr might be necessary to achieve torpedograss control.

La infestación de Panicum repens en el césped Eremochloa ophiuroides ha reducido su calidad en jardines residenciales a lo largo de la Costa del Golfo. Este estudio se realizó para evaluar 3 herbicidas post-emergentes selectivos. Se llevaron a cabo estudios de campo en dos sitios en Louisiana para evaluar el quinclorac, sethoxydim y clethodim aplicados una sola vez o secuencialmente cada 4 semanas para el control de Panicum repens en el césped Eremochloa ophiuroides. Los herbicidas fueron aplicados a parcelas con coberturas mixtas de Panicum repens /Eremochloa ophiuroides en dos sitios en Louisiana y se evaluaron los cambios de la cobertura de Panicum repens y el daño a Eremochloa ophiuroides cada 2 semanas por 16 semanas. Todos los herbicidas controlaron en mayor grado Panicum repens con cada aplicación secuencial. El sethoxydim y el clethodim aplicados tres veces redujeron la cobertura de Panicum repens 84 y 87% respectivamente y en mayor grado que el quinclorac, 12 semanas después del tratamiento inicial (WAIT). El incrementar las dosis de sethoxydim o clethodim no mejoró el control. La reaparición de Panicum repens ocurrió unas cuantas semanas después de la aplicación final, sin importar el herbicida. Solamente aplicaciones múltiples de clethodim al doble de la dosis indicada en la etiqueta o las aplicaciones de quinclorac, ocasionaron daños comercialmente inaceptables (>25%) a Eremochloa ophiuroides. Las aplicaciones múltiples de sethoxydim o clethodim en dosis de 0.32 kg ha−1 o 0.30 kg ha−1, cada 4 semanas, redujeron la competitividad de Panicum repens en Eremochloa ophiuroides, sin embargo, aplicaciones múltiples por más de un año podrían ser necesarias para controlar Panicum repens.

Keywords

Clethodimquincloracsethoxydimtorpedograss, Panicum repens L.centipedegrass, Eremochloa ophiuroides (Munro) HackGulf CoastinjuryLouisiana weed controlturf
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 25 , Issue 2 , June 2011 , pp. 212 - 216
Copyright
Copyright © Weed Science Society of America 

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