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Postemergence Control of Annual Bluegrass (Poa annua spp. reptans) in Creeping Bentgrass (Agrostis stolonifera) Turf

Published online by Cambridge University Press:  20 January 2017

Paul B. Woosley ,
David W. Williams  and
A. J. Powell Jr.
Paul B. Woosley
Affiliation:
Department of Agronomy, Room N222, Agricultural Sciences Ctr. North, University of Kentucky, Lexington, KY 40546-0091
David W. Williams*
Affiliation:
Department of Agronomy, Room N222, Agricultural Sciences Ctr. North, University of Kentucky, Lexington, KY 40546-0091
A. J. Powell Jr.
Affiliation:
Department of Agronomy, Room N222, Agricultural Sciences Ctr. North, University of Kentucky, Lexington, KY 40546-0091
*
Corresponding author's E-mail: [email protected]
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Abstract

The postemergence herbicide ethofumesate and the plant growth regulator paclobutrazol were evaluated for annual bluegrass control in creeping bentgrass turf managed as golf fairways. Both products were applied under several different timing regimes relative to the time of the year. Paclobutrazol treatments provided significantly greater annual bluegrass control than ethofumesate. There were no differences between rates of paclobutrazol (0.28 and 0.14 kg ai/ha) when applied from spring through summer. Annual bluegrass control after spring and summer applications of paclobutrazol was 85% or more. Clipping weight data indicated that paclobutrazol suppressed growth in annual bluegrass longer than in creeping bentgrass. It was concluded that prolonged suppression of annual bluegrass by paclobutrazol resulted in creeping bentgrass dominance and subsequent annual bluegrass control. Additionally, applications of ethofumesate in autumn–winter, followed by paclobutrazol applied in spring–summer, provided significant control of annual bluegrass in 1 yr of the study.

Keywords

Ethofumesatepaclobutrazol, (±)-(R∗R∗)-β-([4-chlorophenyl]-methyl)-α-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanolannual bluegrass, Poa annua spp. annua L., spp. reptans Hausskn. #3 POAANcreeping bentgrass Agrostis stolonifera L. ‘Penncross’, ‘Providence’Growth suppressionAUPPC, area under percent Poa curvesDAA, days after applicationGA, gibberellic acid
Type
Research
Information
Weed Technology , Volume 17 , Issue 4 , December 2003 , pp. 770 - 776
Copyright
Copyright © Weed Science Society of America 

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