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Applications of topramezone and SpeedZone® for POST goosegrass (Eleusine indica) control in hybrid bermudagrass

Published online by Cambridge University Press:  06 April 2021

Devon E. Carroll Open the ORCID record for Devon E. Carroll [Opens in a new window] ,
James T. Brosnan  and
Gregory K. Breeden
Devon E. Carroll*
Affiliation:
Doctoral student, The University of Tennessee, Department of Plant Sciences, Knoxville, TN, USA
James T. Brosnan
Affiliation:
Professor, The University of Tennessee, Department of Plant Sciences, Knoxville, TN, USA
Gregory K. Breeden
Affiliation:
Extension Specialist, The University of Tennessee, Department of Plant Sciences, Knoxville, TN, USA
*
Author for correspondence: Devon Carroll, The University of Tennessee, Department of Plant Sciences, 2505 EJ Chapman Drive, Knoxville, TN37996 E-mail: dcarro17@vols.utk.edu
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Abstract

Topramezone and carfentrazone + 2,4-D + mecoprop-p + dicamba (SpeedZone®) are herbicides labeled for POST goosegrass (Eleusine indica L. Gaertn.) control in hybrid bermudagrass (Cynodon dactylon × C. transvaalensis Burtt Davy). Field research was conducted in Knoxville, TN, during 2019 and 2020 to evaluate goosegrass control and hybrid bermudagrass tolerance to these herbicides applied alone and in mixture. Treatments included topramezone (12.2 g ha–1), SpeedZone® [carfentrazone (33.6 g ha–1) + 2,4-D (1,029 g ha–1) + mecoprop-p (322 g ha–1) + dicamba (91 g ha–1)] and SpeedZone® + topramezone at 12.2, 6.1, 3.6, or 2.4 g ha–1. A nontreated control was included for comparison. Hybrid bermudagrass tolerance was assessed on four cultivars (‘Northbridge’, ‘Tifway’, ‘Tahoma 31’, and ‘TifTuf’) via visual ratings of turfgrass injury and assessments of normalized difference vegetation index (NDVI). At the termination of the experiment, SpeedZone® alone and in mixture with topramezone controlled goosegrass better than or equal to topramezone alone. Mixtures of SpeedZone® + topramezone reduced injury on all cultivars compared to topramezone alone, particularly when mixtures delivered ≤6.1 g ha–1 topramezone. Injury subsided on all cultivars by 28 d after treatment regardless of herbicide. Findings suggest that SpeedZone® can be mixed with topramezone at the rates tested herein to minimize hybrid bermudagrass injury from topramezone applications for goosegrass control.

Keywords

24-Dcarfentrazonedicambamecoprop-ptopramezonebermudagrassCynodon spp.goosegrassEleusine indica L. Gaertnhybrid bermudagrassC. dactylon × C. transvaalensis Burtt DavyTurfgrassherbicideHPPD inhibitors
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 4 , August 2021 , pp. 598 - 603
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Darren Robinson, University of Guelph

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