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Application Timing Affects Bermudagrass Suppression with Mixtures of Fluazifop and Triclopyr

Published online by Cambridge University Press:  20 January 2017

J. T. Brosnan ,
G. K. Breeden ,
M. T. Elmore  and
J. M. Zidek
J. T. Brosnan*
Affiliation:
University of Tennessee, 252 Ellington Plant Science Building, 2431 Joe Johnson Drive, Knoxville, TN 37996
G. K. Breeden
Affiliation:
University of Tennessee, 252 Ellington Plant Science Building, 2431 Joe Johnson Drive, Knoxville, TN 37996
M. T. Elmore
Affiliation:
University of Tennessee, 252 Ellington Plant Science Building, 2431 Joe Johnson Drive, Knoxville, TN 37996
J. M. Zidek
Affiliation:
ZedX Inc., 369 Rolling Ridge Drive, Bellefonte, PA 16823
*
Corresponding author's E-mail: jbrosnan@utk.edu
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Abstract

Bermudagrass is a troublesome weed of zoysiagrass golf-course fairways. Field research was conducted in 2009 and 2010 evaluating bermudagrass suppression with applications of fluazifop plus triclopyr at various timings. Three rates of fluazifop (0.10, 0.21, and 0.32 kg ai ha−1) were applied with triclopyr (1.12 kg ae ha−1) once six thresholds of growing-degree-day accumulation (GDD10C) had been reached: 200, 450, 825, 1,275, 1,775, and 2,250 GDD10C. Yearly accumulated GDD10C values were calculated with a base temperature of 10 C beginning on 1 January. Applications at 200 and 2,250 GDD10C suppressed bermudagrass ≥ 90% at 5 WAT each year. Increased rates of fluazifop did not provide additional bermudagrass suppression at these timings. Cooling accumulation models may be needed to time fall applications, as the 1,775 GDD10C timing in 2009 provided similar bermudagrass suppression to the 2,250 GDD10C timing in 2010. Late-spring and midsummer applications at 450 GDD10C, 825 GDD10C, and 1,275 GDD10C only suppressed bermudagrass 4 to 16% at 6 wk after treatment (WAT) in 2009 and 0 to 57% at 6 WAT in 2010. Zoysiagrass injury measured < 25% for all timings and decreased to 0 to 7% by 5 WAT each year. Future studies should evaluate bermudagrass suppression with other herbicides with the use of growing-degree-day and cooling accumulation models.

Cynodon dactylon es una maleza problemática en campos de golf con la grama Zoysia japonica. Se realizó una investigación de campo en 2009 y 2010 para evaluar la supresión de Cynodon con aplicaciones de fluazifop más triclopyr en varios tiempos. Tres dosis de fluazifop (0.10, 0.21 y 0.32 kg ha−1) se aplicaron con triclopyr (1.12 kg ae ha−1), una vez que se alcanzaron seis umbrales de grados de crecimiento acumulado por día (GDD10C): 200, 450, 825, 1275, 1775 y 2250 GDD10C. Los valores anuales acumulados GDD10C se calcularon usando una temperatura base de 10 C empezando el 1° de enero. Aplicaciones a los 200 y 2250 GDD10C suprimieron Cynodon ≥ 90% a las 5 semanas después del tratamiento cada año. Un incremento en las dosis de fluazifop no proporcionó supresión adicional de Cynodon en estos tiempos de aplicación. Los modelos de enfriamiento acumulativo pueden ser necesarios para programar las aplicaciones de otoño, ya que el tiempo de aplicación a los 1775 GDD10C en 2009 proporcionó supresión de Cynodon similar al tiempo de aplicación a los 2250 GDD10C en 2010. Las aplicaciones tardías en la primavera y a medio verano a los 450 GDD10C, 825 GDD10C y 1725 GDD10C solamente suprimieron Cynodon de 4 a 16% a las 6 semanas después del tratamiento en 2009 y de 0 al 57% a las 6 semanas después del tratamiento en 2010. El daño a Zoysia fue < 25% para todas los tiempos de aplicación y disminuyó de 0 a 7% a las 5 semanas después del tratamiento cada año. Estudios en el futuro deben evaluar la supresión de Cynodon con otros herbicidas, usando modelos de grados de crecimiento acumulado por día y modelos de enfriamiento acumulativo.

Keywords

Fluazifoptriclopyrbermudagrass (Cynodon dactylon L. Pers.) ‘Riviera’zoysiagrass (Zoysia japonica Steud.) ‘Zenith’Efficacygolf coursegrowing-degree dayturf
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 25 , Issue 4 , December 2011 , pp. 591 - 597
Copyright
Copyright © Weed Science Society of America 

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