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Reduction of Torpedograss (Panicum repens) Canopy and Rhizomes by Quinclorac Split Applications

Published online by Cambridge University Press:  20 January 2017

Philip Busey
Philip Busey*
Affiliation:
Environmental Horticulture, Institute of Food and Agricultural Sciences, University of Florida, Fort Lauderdale Research and Education Center, 3205 College Avenue, Fort Lauderdale, FL 33314
*
Corresponding author's E-mail: [email protected]
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Abstract

Two field experiments were conducted to evaluate the reduction of torpedograss canopy by multiple split applications of quinclorac applied postemergence (POST) to bermudagrass golf course roughs in Florida. In one experiment, quinclorac treatments were reapplied for a second year to the same plots, followed by biomass harvest, to evaluate the reduction of torpedograss rhizomes. Quinclorac sprayed at 1.68 kg/ha/yr visually reduced torpedograss canopy to a varying extent, depending on the number of split applications. The most effective treatment, 0.42 kg/ha quinclorac applied four times each year for 2 yr, reduced torpedograss canopy to 10% compared with 86% torpedograss canopy in the untreated plots, and reduced torpedograss dry weight to 1,570 kg/ha compared with 8,010 kg/ha in the untreated plots. After reapplication for 2 yr with the commercially labeled treatment, quinclorac at 0.84 kg/ha applied twice per year, torpedograss canopy was reduced to 45% and dry weight to 4,640 kg/ha. Visual evaluation of canopy was too optimistic in representing the herbicidal control of torpedograss by quinclorac because torpedograss regrew from rhizomes, and canopy was a relatively small part of the plant. In plots not chemically treated, pachymorph rhizomes were 63%, leptomorph rhizomes were 24%, and leaves were only 13% of the total dry weight of torpedograss.

Keywords

Quinclorachybrid bermudagrass, Cynodon transvaalensis × C. dactylontorpedograss, Panicum repens L. #3 PANREGolf courseturfMSO, methylated seed oilOM, organic matterPOST, postemergenceTPC, Tournament Players ClubWAIT, weeks after initial treatment
Type
Note
Information
Weed Technology , Volume 17 , Issue 1 , March 2003 , pp. 190 - 194
Copyright
Copyright © Weed Science Society of America 

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References

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