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Purple Nutsedge (Cyperus rotundus) and False-Green Kyllinga (Kyllinga gracillima) Control in Bermudagrass Turf

Published online by Cambridge University Press:  20 January 2017

Travis W. Gannon ,
Fred H. Yelverton  and
Lane P. Tredway
Travis W. Gannon*
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695
Fred H. Yelverton
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695
Lane P. Tredway
Affiliation:
Department of Plant Pathology, North Carolina State University, Campus Box 7616, Raleigh, NC 27695
*
Corresponding author's E-mail: travis_gannon@ncsu.edu
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Abstract

Experiments were conducted during 2007 and 2008 to evaluate various herbicide treatment regimes for POST purple nutsedge and false-green kyllinga control. Evaluated herbicides included halosulfuron, sulfentrazone, sulfosulfuron, and trifloxysulfuron. Evaluated treatments did not cause objectionable bermudagrass injury at any time. Results were variable across years, likely due to reduced rainfall in 2007 causing reduced purple nutsedge and false-green kyllinga growth. In 2007, averaged across herbicide rate and number of applications, sulfosulfuron provided greater purple nutsedge control than trifloxysulfuron. Sulfosulfuron and trifloxysulfuron provided similar levels of control in 2008, although both were less effective than in 2007. In 2007, sulfosulfuron and trifloxysulfuron provided excellent (> 90%) false-green kyllinga control, and trifloxysulfuron provided greater control (80%) compared to sulfosulfuron (61%) in 2008. Sulfentrazone provided < 30 and 60% purple nutsedge and false-green kyllinga control, respectively. A sequential application applied 6 wk after initial treatment provided the highest level of purple nutsedge and false-green kyllinga control with evaluated herbicides. Tank-mix partners to enhance purple nutsedge control with sulfentrazone provided inconsistent results. Sulfosulfuron and trifloxysulfuron offer acceptable POST perennial sedge control in tolerant warm-season turfgrasses.

Durante 2007 y 2008 se realizaron experimentos para evaluar varios regímenes de tratamientos de herbicida para el control pos-emergente de Cyperus rotundus y Kyllinga gracillima. Los herbicidas evaluados incluyeron halosulfuron, sulfentrazone, sulfosulfuron y trifloxysulfuron. Los tratamientos evaluados no causaron daño objetable al Cynodon spp. en ningún momento. Los resultados fueron variables entre años, probablemente debido a la escasez de lluvias en 2007 que provocó una reducción en el crecimiento de C. rotundus y K. gracillima. En 2007, sacando un promedio entre todas las dosis de herbicida y número de aplicaciones, el sulfosulfuron proporcionó un mayor control de C. rotundus que el trifloxysulfuron. Sulfosulfuron y trifloxysulfuron proporcionaron niveles similares de control en 2008, aunque ambos fueron menos efectivos que en 2007. En 2007, sulfosulfuron y trifloxysulfuron proporcionaron un excelente control (> 90%) de K. gracillima, mientras que trifloxysulfuron proporcionó mayor control (80%) comparado con sulfosulfuron (61%) en 2008. Sulfentrazone proporcionó un control de C. rotundus y K. gracillima de < 30 y 60%, respectivamente. Una aplicación secuencial realizada 6 semanas después del tratamiento inicial proporcionó el nivel más alto de control de C. rotundus y K. gracillima con los herbicidas evaluados. Mezclas con otros herbicidas para mejorar el control de C. rotundus con sulfentrazone, proporcionaron resultados inconsistentes. Sulfosulfuron y trifloxysulfuron ofrecen control pos-emergente aceptable de especies perenes de la familia Cyperaceae en céspedes tolerantes a estaciones calurosas.

Keywords

Halosulfuronsulfentrazonesulfosulfurontrifloxysulfuronfalse-green kyllinga, Kyllinga gracillima L.purple nutsedge, Cyperus rotundus L.bermudagrass, Cynodon sppHerbicide efficacysequential applicationssequential application timingtank-mix partner
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 26 , Issue 1 , March 2012 , pp. 61 - 70
Copyright
Copyright © Weed Science Society of America 

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