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Control of Torpedograss (Panicum repens) with Trifloxysulfuron-Sodium in Bermudagrass (Cynodon dactylon × Cynodon transvaalensis) Turf

Published online by Cambridge University Press:  20 January 2017

Daniel O. Stephenson IV ,
Barry J. Brecke  and
J. Bryan Unruh
Daniel O. Stephenson IV*
Affiliation:
West Florida Research and Education Center, Agronomy Department, Department of Environmental Horticulture, University of Florida, 5988 Highway 90, Building 4900, Milton, FL 32583
Barry J. Brecke
Affiliation:
West Florida Research and Education Center, Agronomy Department, Department of Environmental Horticulture, University of Florida, 5988 Highway 90, Building 4900, Milton, FL 32583
J. Bryan Unruh
Affiliation:
West Florida Research and Education Center, Agronomy Department, Department of Environmental Horticulture, University of Florida, 5988 Highway 90, Building 4900, Milton, FL 32583
*
Corresponding author's E-mail: dstephenson@uaex.edu
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Abstract

Torpedograss is a serious problem in southern turfgrass, especially along the U.S. gulf coast. Studies were conducted in 1999, 2000, 2002, and 2003 to evaluate single and sequential applications of trifloxysulfuron-sodium for torpedograss control in bermudagrass turf. In 1999/2000, single applications of trifloxysulfuron-sodium at 75 g ai/ha provided at least 10% better torpedograss control than 25 g/ha 7 and 15 wk after initial treatment (WAIT). When evaluated 15 WAIT, sequential applications of trifloxysulfuron-sodium provided 87% control, similar to 84% control observed with quinclorac + diclofop-methyl, each applied at 840 g ai/ha. Both treatments controlled torpedograss better than a single trifloxysulfuron-sodium application (61%) in 1999/2000. Torpedograss control was less in 2002/2003 than in 1999/2000 because of high rainfall, which encouraged aggressive torpedograss growth and possible movement of trifloxysulfuron-sodium below its rooting zone. No differences were noted among trifloxysulfuron-sodium rates or number of applications in 2002/2003. Quinclorac + diclofop-methyl controlled torpedograss greater than trifloxysulfuron-sodium 15 WAIT in 2002/2003, but neither treatment provided greater than 45% control. These results suggest that trifloxysulfuron-sodium controls torpedograss when rainfall is not excessive.

Keywords

Bermudagrass, Cynodon dactylon (L.) Pers. × Cynodon transvaalensis Burtt-Davey ‘Tifway’torpedograss, Panicum repens L. # PANREApplication rateapplication frequencyWAIT, weeks after initial treatment
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 2 , June 2006 , pp. 351 - 355
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 This research was supported by the Florida Agricultural Experiment Station and approved for publication as Journal Series R-10910.
Current address: Cropping Systems Agronomist, Northeast Research and Extension Center, University of Arkansas, Post Office Box 48, Keiser, AR 72351.

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