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Torpedograss (Panicum repens) Control with Quinclorac in Bermudagrass (Cynodon dactylon × C. transvaalensis) Turf

Published online by Cambridge University Press:  20 January 2017

Barry J. Brecke ,
J. Bryan Unruh  and
Joan A. Dusky
Barry J. Brecke*
Affiliation:
University of Florida, West Florida Research and Education Center, Jay, FL 32565
J. Bryan Unruh
Affiliation:
University of Florida, West Florida Research and Education Center, Jay, FL 32565
Joan A. Dusky
Affiliation:
Extension, University of Florida, 1038 McCarty Hall, Gainesville, FL 32611
*
Corresponding author's E-mail: bjbe@gnv.ifas.ufl.edu.
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Abstract

Torpedograss is a serious problem in southern turfgrass, especially along the U.S. gulf coast. Studies were conducted during 1998, 1999, and 2000 to evaluate quinclorac for torpedograss control in bermudagrass turf. Three applications of quinclorac at 0.6 kg/ha spaced 21 d apart provided better torpedograss control (88%) than two applications at 0.8 kg/ha (69%) or one application at 1.7 kg/ha (69%). Two applications of quinclorac (0.8 kg/ha) plus diclofop (0.8 kg/ha) provided better torpedograss control (82%) than either herbicide applied alone when evaluated after a single season of application. Increasing the mowing interval prior to quinclorac application to allow for more foliage to be present did not improve control. Nitrogen application prior to quinclorac treatment did not improve torpedograss control. Long-term control will most likely require quinclorac applications for more than one season.

Keywords

Diclofopquincloracbermudagrass, Cynodon dactylon (L.) Pers. × C. transvaalensis Burtt-Davey ‘Tifway’torpedograss, Panicum repens L. # PANREApplication frequencycultural practicesmowing intervalnitrogen fertilityturfgrassLSD, least significant differencePOST, postemergenceWAIT, weeks after initial treatment
Type
Research
Information
Weed Technology , Volume 15 , Issue 4 , December 2001 , pp. 732 - 736
Copyright
Copyright © Weed Science Society of America 

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References

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