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Zoysiagrass Seedhead Suppression with Imidazolinone Herbicides

Published online by Cambridge University Press:  20 January 2017

James T. Brosnan ,
Greg K. Breeden ,
Matthew T. Elmore ,
Aaron J. Patton  and
Dan V. Weisenberger
James T. Brosnan*
Affiliation:
University of Tennessee, 252 Ellington Plant Science, Building 2431 Joe Johnson Drive, Knoxville, TN 37996
Greg K. Breeden
Affiliation:
University of Tennessee, 252 Ellington Plant Science, Building 2431 Joe Johnson Drive, Knoxville, TN 37996
Matthew T. Elmore
Affiliation:
University of Tennessee, 252 Ellington Plant Science, Building 2431 Joe Johnson Drive, Knoxville, TN 37996
Aaron J. Patton
Affiliation:
Purdue University, 915 West State Street, West Lafayette, IN 47907
Dan V. Weisenberger
Affiliation:
Purdue University, 915 West State Street, West Lafayette, IN 47907
*
Corresponding author's E-mail: jbrosnan@utk.edu
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Abstract

Options for suppressing zoysiagrass seedheads in managed turfgrass systems are limited. Experiments were conducted in 2010 and 2011 evaluating the use of imazamox (26, 52, and 70 g ai ha−1) or imazapic (52 g ai ha−1) for ‘Zenith' and ‘Meyer' zoysiagrass seedhead suppression. Imazamox and imazapic at ≥ 52 g ai ha−1 suppressed Zenith zoysiagrass seedheads ≥ 95% at 2 to 6 wk after initial treatment (WAIT) each year. Slight injury (< 10%) was observed with these treatments; however, effective seedhead suppression resulted in increased (i.e., darker) green color from 8 to 15 WAIT each year. Relative chlorophyll index values for imazamox- and imazapic-treated plots ranged from 100 to 147% of the nontreated control in 2010 and 89 to 125% of the nontreated in 2011. On Meyer zoysiagrass, imazamox and imazapic at ≥ 52 g ha−1 reduced seedhead counts greater than 90% in both Tennessee and Indiana. However, significant (> 25%) injury was reported with these treatments at one experimental location. Although imazamox and imazapic have efficacy for zoysiagrass seedhead suppression, additional studies are needed to determine factors affecting zoysiagrass injury potential from imazamox and imazapic applications.

Las opciones para suprimir las inflorescencias de Zoysia japonica en céspedes manejados son limitadas. En 2010 y 2011 se realizaron experimentos para evaluar el uso de imazamox (26, 52 y 70 g ai ha-1) o imazapic (52 g ai ha-1) para la supresión de inflorescencias de Z. japonica ‘Zenith’ y ‘Meyer’. Imazamox e imazapic a 52 g ai ha-1 suprimió las inflorescencias de Zenith ≥95% a 2-6 semanas después del tratamiento inicial (WAIT) en cada año. Un ligero daño (<10%) fue observado con estos tratamientos. Sin embargo, la efectiva supresión de inflorescencias resultó en un incremento del color verde (i.e. más oscuro) desde 8 hasta 15 WAIT en cada año. Los valores relativos de índice de clorofila para lotes tratados con imazamox e imazapic variaron de 100 a 147% en comparación con el testigo no-tratado en 2010 y de 89 a 125% en 2011. En Meyer, imazamox e imazapic a ≥52 g ai ha-1 redujeron los conteos de inflorescencias en más de 90% en Tennessee e Indiana. Sin embargo, con estos tratamientos se reportó un daño significativo (>25%) en uno de los sitios experimentales. Aunque imazamox e imazapic muestran eficacia para la supresión de inflorescencias de Z. japonica, se necesitan estudios adicionales para determinar los factores que afectan el daño potencial de Z. japonica con aplicaciones de estos herbicidas.

Keywords

Imazamoximazapiczoysiagrass, Zoysia japonica Steud. ‘Zenith' and ‘Meyer'Golf courseJapanese lawngrassplant growth regulatorseedhead suppressionturf
Type
Weed Management—Other Crops/AREAS
Information
Weed Technology , Volume 26 , Issue 4 , December 2012 , pp. 708 - 713
Copyright
Copyright © Weed Science Society of America 

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