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Seasonal Effects on Annual Bluegrass (Poa annua) Control in Creeping Bentgrass with Bispyribac-Sodium

Published online by Cambridge University Press:  20 January 2017

Darren W. Lycan  and
Stephen E. Hart
Darren W. Lycan
Affiliation:
Rutgers, The State University of New Jersey, New Brunswick, NJ 08901
Stephen E. Hart*
Affiliation:
Rutgers, The State University of New Jersey, New Brunswick, NJ 08901
*
Corresponding author's E-mail: hart@aesop.rutgers.edu
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Abstract

Studies were conducted in 2002 and 2003 on a golf course fairway in New Jersey to compare spring, summer, and fall treatments of bispyribac-sodium for annual bluegrass control and creeping bentgrass tolerance. Single applications at 74, 111, or 148 g ai/ha were applied in May, August, or October. Split applications of 37 followed by (fb) 37 or 74 fb 74 g/ha applied 3 wk apart were also evaluated. Summer-applied bispyribac-sodium did not reduce bentgrass quality, whereas spring and fall treatments reduced turf quality at 3 wk after treatment and fall treatments in 2002 substantially reduced bentgrass quality. Summer treatments were more effective than spring or fall treatments in reducing annual bluegrass cover. Final evaluations revealed 36, 31, 21, and 26% annual bluegrass cover averaged across nontreated, spring-treated, summer-treated, and fall-treated plots, respectively. This study demonstrates that two split applications of bispyribac-sodium at 74 g/ha in summer can effectively reduce annual bluegrass cover while minimizing creeping bentgrass injury.

Keywords

Bispyribac-sodium, 2,6 bis[(4,6-dimethoxy-2-pyrmidinyl)oxy] benzoic acidannual bluegrass, Poa annua var. annua (L.) Timm, var. reptans (Hausskn.) Timm #3 POAANcreeping bentgrass, Agrostis stolonifera L. ‘L-93’ and ‘Penncross’Turf-grass toleranceALS, acetolactate synthase (EC 2.2.1.6)fb, followed byWAT, weeks after treatment
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 3 , September 2006 , pp. 722 - 727
Copyright
Copyright © Weed Science Society of America 

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