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Annual Bluegrass (Poa annua) Control in Creeping Bentgrass (Agrostis stolonifera) Putting Greens with Bispyribac-sodium

Published online by Cambridge University Press:  20 January 2017

Travis C. Teuton ,
Christopher L. Main ,
John C. Sorochan ,
J. Scott McElroy  and
Thomas C. Mueller
Travis C. Teuton*
Affiliation:
Division of Plant Sciences, University of Missouri–Columbia, Columbia, MO 65211
Christopher L. Main
Affiliation:
Pee Dee Research and Education Center, Clemson University, Florence, SC 29506
John C. Sorochan
Affiliation:
Plant Sciences Department, University of Tennessee, Knoxville, TN 37996
J. Scott McElroy
Affiliation:
Plant Sciences Department, University of Tennessee, Knoxville, TN 37996
Thomas C. Mueller
Affiliation:
Plant Sciences Department, University of Tennessee, Knoxville, TN 37996
*
Corresponding author's E-mail: [email protected]
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Abstract

Annual bluegrass is one of the most difficult-to-control weeds in creeping bentgrass putting greens. Field trials were conducted in 2003 and 2005 to evaluate bispyribac-sodium for annual bluegrass management in creeping bentgrass greens maintained at a 3 mm mowing height. Bispyribac-sodium applied weekly at 12 or 24 g ai/ha controlled annual bluegrass 86% 12 wk after initial treatment (WAIT). In 2003, bispyribac-sodium applied at 12 and 24 g/ha/wk injured creeping bentgrass approximately 15 and 50% by 4 WAIT, respectively. However, injury was transient and was not evident by 12 WAIT. In 2005, the 12 and 24 g/ha/wk injured creeping bentgrass 15 and 85% by 8 WAIT, respectively, and was still evident throughout the trial. Putting green quality was reduced when compared to nontreated creeping bentgrass by the same treatments. The removal of annual bluegrass caused soil exposure until creeping bentgrass grew over the bare areas, contributing to decreased quality evaluations. Management of annual bluegrass in creeping bentgrass putting greens is possible with bispyribac-sodium. However, these results indicate bispyribac-sodium can cause excessive injury when applied to creeping bentgrass mowed at 3 mm.

Keywords

Bispyribac-sodiumannual bluegrass, Poa annua L. POANNcreeping bentgrass, Agrostis stolonifera L. AGSST, ‘Penncross’AGSSTPOANN
Type
Research
Information
Weed Technology , Volume 21 , Issue 2 , June 2007 , pp. 426 - 430
Copyright
Copyright © Weed Science Society of America 

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