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Seashore Paspalum Seedhead Control and Growth Regulation with Flazasulfuron and Trinexapac-Ethyl

Published online by Cambridge University Press:  20 January 2017

Patrick E. McCullough ,
William Nutt ,
Tim R. Murphy  and
Paul Raymer
Patrick E. McCullough*
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223-1797
William Nutt
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223-1797
Tim R. Murphy
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223-1797
Paul Raymer
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223-1797
*
Corresponding author's E-mail: [email protected]
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Abstract

Seashore paspalum is used on golf courses in warm temperate regions, but prolific growth and seedhead development may reduce turfgrass quality. Field experiments were conducted to investigate efficacy of flazasulfuron and trinexapac-ethyl on seashore paspalum seedhead suppression, clipping reduction, and canopy height. Flazasulfuron applied from 4.5 to 27 g ai ha−1 increased clipping reductions from the untreated by 22 to 75% and seedhead suppression from the untreated by 16 to 86% at 2 to 4 wk after treatment. Trinexapac-ethyl applied alone at 96 g ai ha−1 provided erratic levels of seedhead suppression from the untreated, but reduced clippings by approximately 50 to 75% from nontreated by 2 to 4 wk after treatment. On several dates, trinexapac-ethyl enhanced clipping reductions and seedhead suppression from flazasulfuron compared to flazasulfuron alone. Trinexapac-ethyl exacerbated seashore paspalum injury from high flazasulfuron rates (18 to 27 g ha−1) but injury never exceeded 23%. Trinexapac-ethyl reduced seashore paspalum height by 50% in unmowed areas at 16 wk. Flazasulfuron at 16 or 27 g ha−1 with trinexapac-ethyl provided consistent seedhead suppression and clipping reductions ranging from approximately 70 to 95% of nontreated. These tank-mixtures have promising implications for use in seashore paspalum golf course fairways.

Paspalum vaginatum se usa para campos de golf en regiones cálido-templadas, pero el crecimiento prolífico y el desarrollo de la inflorescencia pueden reducir la calidad del césped. Se realizaron experimentos de campo para investigar la eficacia de flazasulfurón y trinexapac-etil en la supresión de inflorescencias, reducción en los cortes y la altura de P. vaginatum. El flazasulfurón aplicado de 4.5 a 27 g ia/ha, en comparación con el testigo no tratado, redujo los cortes de 22 a 75% y suprimió el desarrollo de las inflorescencias de 16 a 86%, de dos a cuatro semanas posteriores al tratamiento. Comparado con el testigo no tratado, el trinexapac-etil aplicado por sí solo a 96 g ia/ha, proporcionó niveles erráticos de supresión de la inflorescencia, pero redujo los cortes en aproximadamente 50 a 75%, por dos a cuatro semanas después del tratamiento. En varias fechas, la aplicación de trinexapac-etil en combinación con flazasulfurón, mejoró las reducciones en los cortes y la supresión de inflorescencias en comparación con la aplicación de solo flazasulfurón. El trinexapac-etil asociado con altas dosis de flazasulfurón (18 a 27 g/ha), agravó el daño en P. vaginatum pero dicho daño nunca excedió 23%. El trinexapac-etil redujo la altura de P. vaginatum en 50% en las áreas sin cortar y proporcionó consistente supresión de inflorescencias y reducciones en los cortes, que variaron aproximadamente de 70 a 95% en comparación con el testigo no tratado. Estas mezclas tienen implicaciones prometedoras para su uso en P. vaginatum establecido en áreas de calles de campos de golf.

Keywords

Flazasulfurontrinexapac-ethylseashore paspalum, Paspalum vaginatum Sw., ‘Sea Isle 1’, ‘Sea Isle Supreme’Efficacyherbicideinjuryturfgrass
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 25 , Issue 1 , March 2011 , pp. 64 - 69
Copyright
Copyright © Weed Science Society of America 

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