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Control of torpedograss (Panicum repens) and Southern watergrass (Luziola fluitans) in bermudagrass turf

Published online by Cambridge University Press:  03 July 2019

Philip J. Brown Open the ORCID record for Philip J. Brown [Opens in a new window] ,
Robert B. Cross ,
Lambert B. McCarty  and
Robert A. Kerr
Philip J. Brown*
Affiliation:
Post-Doctoral Researcher, Clemson University, Department of Plant and Environmental Sciences, Poole Agriculture Center, Clemson, SC, USA
Robert B. Cross
Affiliation:
Post-Doctoral Researcher, Clemson University, Department of Plant and Environmental Sciences, Poole Agriculture Center, Clemson, SC, USA
Lambert B. McCarty
Affiliation:
Professor, Clemson University, Department of Plant and Environmental Sciences, Poole Agriculture Center, Clemson, SC, USA
Robert A. Kerr
Affiliation:
Graduate Research Assistant, Department of Plant and Environmental Sciences, Poole Agriculture Center, Clemson, SC, USA
*
Author for correspondence: Philip Brown, Department of Plant and Environmental Sciences, E-143 Poole Agriculture Center, Clemson University, Clemson, SC 29634-0310. Email: philipb@clemson.edu
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Abstract

Two species, torpedograss and Southern watergrass, are very difficult to selectively control when they invade desirable turfgrass stands. The purpose of this study was to evaluate selective control of torpedograss and Southern watergrass in ‘Tifway’ bermudagrass turf. Greater than 86% control of torpedograss was observed 4 wk after sequential treatment (WAST) with quinclorac, trifloxysulfuron-sodium, quinclorac and trifloxysulfuron-sodium, sulfentrazone + imazethapyr and quinclorac and trifloxysulfuron-sodium, and quinclorac and trifloxysulfuron-sodium followed by (fb) glyphosate. However, by 8 WAST, control was reduced to <36% for all treatments. Greatest Southern watergrass control was achieved 4 WAST with trifloxysulfuron-sodium (83%), and thiencarbazone-methyl + foramsulfuron + halosulfuron-methyl (75%). Limited control (<30%) was observed with other treatments. By 8 WAST, Southern watergrass control was <12% for all treatments. This study suggests that short-term control/suppression of these two species is possible; however, long-term control is limited with single-year programs. These weeds will probably require multiple applications in successive years to reduce infestations. Future research should continue to screen other herbicides, combinations, and timings for control of these and other perennial grass weeds.

Keywords

Patrick E. McCullough, University of GeorgiaTurfgrassweed controlaquatic weedsGlyphosatequincloracsulfentrazone + imazethapyrthiencarbazone-methyl + foramsulfuron + halosulfuron-methyltrifloxysulfuron-sodiumSouthern watergrass, Luziola fluitans (Michx.) Terrell & H. Rob.‘Tifway’ bermudagrass, Cynodon transvaalensis Burtt Davy × dactylon (L.) Pers.torpedograss, Panicum repens L.
Type
Research Article
Information
Weed Technology , Volume 33 , Issue 4 , August 2019 , pp. 616 - 619
Copyright
© Weed Science Society of America, 2019 

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