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Long-Term Roughstalk Bluegrass Control in Creeping Bentgrass Fairways

Published online by Cambridge University Press:  14 September 2017

Sandeep S. Rana  and
Shawn D. Askew
Sandeep S. Rana
Affiliation:
Graduate Research Assistant and Associate Professor, Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 675 Old Glade Road, Blacksburg, VA 24060
Shawn D. Askew*
Affiliation:
Graduate Research Assistant and Associate Professor, Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 675 Old Glade Road, Blacksburg, VA 24060
*
*Corresponding author’s E-mail: [email protected]
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Abstract

Methiozolin is an isoxazoline herbicide that selectively controls annual bluegrass in cool-season turf and may control roughstalk bluegrass, another weedy Poa species that is problematic in many turfgrass systems. However, the majority of research to date is limited to evaluating methiozolin efficacy for annual bluegrass control in creeping bentgrass putting greens. Research was conducted comparing various application regimes of methiozolin and other herbicides for long-term roughstalk bluegrass control in creeping bentgrass golf fairways. Methiozolin-only treatments did not injure creeping bentgrass or reduce normalized difference vegetative index (NDVI) at 2 golf course locations based on 20 evaluation dates over a 2.5-yr period. The 2.5-yr average turf quality generally declined as roughstalk bluegrass control increased due to transient turf cover loss. At 1 yr after last treatment, methiozolin at 1500 g ai ha-1 applied four times in fall reduced roughstalk bluegrass cover 85%. This was equivalent to methiozolin at 1000 g ha-1 applied four times in fall, but greater than low rates of methiozolin applied four times in spring or twice in fall and spring. Amicarbazone, primisulfuron, and bispyribac-sodium alone either did not effectively reduce roughstalk bluegrass cover, or did so at the expense of increased creeping bentgrass injury. Results of this study suggest that methiozolin alone or tank-mixed with amicarbazone or primisulfuron is an effective long-term approach for selectively controlling roughstalk bluegrass in creeping bentgrass.

Keywords

Amicarbazonebispyribac-sodiummethiozolin5-(2,6-difluorobenzyl)oxymethyl-5-methyl-3-(3-methylthiophen-2-yl)-12-isoxazolinecode names: EK-5229, SJK-03, and MRC-01, prmisulfuron, annual bluegrass, Poa annua L.roughstalk bluegrass, Poa trivialis L.creeping bentgrass, Agrostis stolonifera L.Creeping bentgrass injurygrid countline-intersect samplinglong-term weed controlnormalized difference vegetative indexroughstalk bluegrass controlturfgrass quality
Type
Weed Management-Other Crops/Areas
Information
Weed Technology , Volume 31 , Issue 5 , October 2017 , pp. 714 - 723
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate editor for this paper: Barry Brecke, University of Florida.

References

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