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Bispyribac-Sodium Application Regimes for Annual Bluegrass (Poa annua) Control on Creeping Bentgrass (Agrostis stolonifera) Putting Greens

Published online by Cambridge University Press:  20 January 2017

Patrick E. McCullough  and
Stephen E. Hart
Patrick E. McCullough*
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223-1797
Stephen E. Hart
Affiliation:
Department of Plant Biology and Pathology, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901-8520
*
Corresponding author's E-mail: pmccull@uga.edu.
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Abstract

Bispyribac-sodium effectively controls annual bluegrass in creeping bentgrass fairways but efficacy on putting greens may be affected by management differences and thus, application regimes may need to be modified for effective annual bluegrass control. To test this hypothesis, field experiments investigated various bispyribac-sodium application regimens for annual bluegrass control on creeping bentgrass putting greens. Bispyribac-sodium regimes totaling 148, 222, and 296 g ha−1 controlled annual bluegrass 81, 83, and 91%, respectively, over 2 yr. Pooled over herbicide rates, bispyribac-sodium applied two, three, and six times controlled annual bluegrass 78, 83, and 94%, respectively. The most effective bispyribac-sodium regime was 24.6 g ha−1 applied weekly, which controlled annual bluegrass 90% after 8 wk with acceptable levels of creeping bentgrass discoloration. After 8 wk, all regimes reduced turf quality as a result of voids in turf following annual bluegrass control; regimes with six applications reduced turf quality the most.

El sodio bispyribac efectivamente controla la poa annua (annual blue grass) en campos de golf con Agrostis stolonifera (creeping betngrass) pero la eficacia podría ser afectada por las diferencias en el manejo, y por tal motivo los regímenes de aplicación quizás necesiten ser modificados para un control efectivo de la poa annua. Para poder probar esta hipótesis, se llevaron al cabo experimentos de campo con diferentes regímenes de aplicaciones de sodio bispyribac para el control de esta maleza. Los regímenes de sodio bispyribac sumaron 148, 222 y 296 g ha−1 controlaron la poa annua en un 81, 83 y 91% respectivamente durante los dos años. Las dosis de herbicida sodio bispyribac aplicado dos, tres y seis veces controlaron la poa annua en un 78, 83 y 94% respectivamente. Los regímenes más efectivos de bispyribac fueron de 24.6 g ha−1 aplicado semanalmente, los cuales controlaron la poa annua en un 90% después de 8 semanas con niveles aceptables de decoloración del bentgrass. Después de ocho semanas todos los regímenes redujeron la calidad del zacate ya que causaron muchos parches sin zacate después de la aplicación anual de control de la poa annua; los regímenes con seis aplicaciones redujeron en mayor grado la calidad del zacate.

Keywords

Bispyribac-sodiumannual bluegrassPoa annua L.creeping bentgrassAgrostis stolonifera L. ‘L-93’Chlorosisefficacyturfgrass
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 24 , Issue 3 , September 2010 , pp. 332 - 335
Copyright
Copyright © Weed Science Society of America 

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