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Tropical Signalgrass (Urochloa subquadripara) Control with Preemergence- and Postemergence-Applied Herbicides

Published online by Cambridge University Press:  20 January 2017

Travis C. Teuton ,
J. Bryan Unruh ,
Barry J. Brecke ,
Greg E. Macdonald ,
Grady L. Miller  and
Joyce Tredaway Ducar
Travis C. Teuton*
Affiliation:
Department of Agronomy, University of Florida, Gainesville, FL 32611
J. Bryan Unruh
Affiliation:
Departments of Agronomy and Environmental Horticulture, University of Florida West Florida Research and Education Center, Milton, FL 32583
Barry J. Brecke
Affiliation:
Departments of Agronomy and Environmental Horticulture, University of Florida West Florida Research and Education Center, Milton, FL 32583
Greg E. Macdonald
Affiliation:
Departments of Agronomy and Environmental Horticulture, University of Florida, Gainesville, FL 32611
Grady L. Miller
Affiliation:
Departments of Agronomy and Environmental Horticulture, University of Florida, Gainesville, FL 32611
Joyce Tredaway Ducar
Affiliation:
Department of Animal and Plant Sciences, Berry College, Mt. Berry, GA 30149
*
Corresponding author's E-mail: tteuton@utk.edu
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Abstract

Tropical signalgrass is one of the most serious weed problems in the St. Augustinegrass sod production in Florida, and its presence increases production costs and lowers turfgrass quality. The objectives of our research were to: (1) evaluate herbicides preemergence and postemergence for control of tropical signalgrass and (2) compare control of tropical signalgrass and other problem weeds (torpedograss, blanket crabgrass, and India crabgrass) with postemergence herbicides. In preemergence herbicide field trials, only benefin + oryzalin, imazapic, imazapic + 2,4-D, and oryzalin provided ≥75% tropical signalgrass control 8 wk after application (WAA). By 11 WAA, only benefin + oryzalin and imazapic + 2,4-D provided ≥75% tropical signalgrass control. In greenhouse experiments, eight herbicide treatments were applied postemergence to tropical signalgrass seedlings at the two-, four-, six-, and eight-leaf stages. Asulam and CGA 362622 provided ≥89% tropical signalgrass control at all application timings. Imazaquin controlled tropical signalgrass ≥98% when applied before the eight-leaf stage. However, in field trials with mature tropical signalgrass (>20 cm stolons), none of the 20 herbicide treatments applied postemergence provided acceptable control.

Keywords

AsulambenefinCGA 362622, N-[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]-3-(2,2,2-trifluoroethoxy)-2-pyridinesulfonamide2,4-Dimazapicimazaquinoryzalinblanket crabgrass, Digitaria serotina (Walt.) Michx. # DIGSOIndia crabgrass, Digitaria longiflora (Retz.) Pers. # DIGLOSt. Augustinegrass, Stenotaphrum secondatum (Walt.) Kuntztorpedograss, Panicum repens L. # PANREtropical signalgrass, Urochloa subquadripara (Trin.) R. D. Webster # BRASUBRASUDIGLODIGSOPANREWAA, weeks after application
Type
Research
Information
Weed Technology , Volume 18 , Issue 2 , June 2004 , pp. 419 - 425
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Publication R-09680 Florida Agricultural Experiment Station Journal Series.
Current address: University of Tennessee, 2431 Center Drive, 252 Ellington Building, Knoxville, TN 37996

References

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