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Controlling Herbicide-Resistant Annual Bluegrass (Poa annua) Phenotypes with Methiozolin

Published online by Cambridge University Press:  22 May 2017

James T. Brosnan ,
Jose J. Vargas ,
Gregory K. Breeden ,
Sarah L. Boggess ,
Margaret A. Staton ,
Phillip A. Wadl  and
Robert N. Trigiano
James T. Brosnan*
Affiliation:
Associate Professor, Research Associate, and Extension Specialist, Department of Plant Sciences, University of Tennessee Institute of Agriculture, 2431 Joe Johnson Drive, Knoxville, TN 37996
Jose J. Vargas
Affiliation:
Associate Professor, Research Associate, and Extension Specialist, Department of Plant Sciences, University of Tennessee Institute of Agriculture, 2431 Joe Johnson Drive, Knoxville, TN 37996
Gregory K. Breeden
Affiliation:
Associate Professor, Research Associate, and Extension Specialist, Department of Plant Sciences, University of Tennessee Institute of Agriculture, 2431 Joe Johnson Drive, Knoxville, TN 37996
Sarah L. Boggess
Affiliation:
Research Associate, Assistant Professor, and Professor, Department of Entomology and Plant Pathology, University of Tennessee Institute of Agriculture, 2431 Joe Johnson Drive, Knoxville, TN 37996
Margaret A. Staton
Affiliation:
Research Associate, Assistant Professor, and Professor, Department of Entomology and Plant Pathology, University of Tennessee Institute of Agriculture, 2431 Joe Johnson Drive, Knoxville, TN 37996
Phillip A. Wadl
Affiliation:
Research Geneticist, US Vegetable Laboratory, United States Department of Agriculture, 2700 Savannah Highway, Charleston, SC 29414
Robert N. Trigiano
Affiliation:
Research Associate, Assistant Professor, and Professor, Department of Entomology and Plant Pathology, University of Tennessee Institute of Agriculture, 2431 Joe Johnson Drive, Knoxville, TN 37996
*
*Corresponding author’s E-mail: jbrosnan@utk.edu
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Abstract

Methiozolin is an isoxazoline herbicide being investigated for selective POST annual bluegrass control in managed turfgrass. Research was conducted to evaluate methiozolin efficacy for controlling two annual bluegrass phenotypes with target-site resistance to photosystem II (PSII) or enolpyruvylshikimate-3-phosphate synthase (EPSPS)-inhibiting herbicides (i.e., glyphosate), as well as phenotypes with multiple resistance to microtubule and EPSPS or PSII and acetolactate synthase (ALS)-inhibiting herbicides. All resistant phenotypes were established in glasshouse culture along with a known herbicide-susceptible control and treated with methiozolin at 0, 125, 250, 500, 1000, 2000, 4000, or 8000 g ai ha−1. Methiozolin effectively controlled annual bluegrass with target-site resistance to inhibitors of EPSPS, PSII, as well as multiple resistance to EPSPS and microtubule inhibitors. Methiozolin rates required to reduce aboveground biomass of these resistant phenotypes 50% (GR50 values) were not significantly different from the susceptible control, ranging from 159 to 421 g ha−1. A phenotype with target-site resistance to PSII and ALS inhibitors was less sensitive to methiozolin (GR50=862 g ha−1) than a susceptible phenotype (GR50=423 g ha−1). Our findings indicate that methiozolin is an effective option for controlling select annual bluegrass phenotypes with target-site resistance to several herbicides.

Keywords

Methiozolinannual bluegrass, Poa annua L.Alpha tubulingolf coursemutationresistancetarget siteturfturfgrass.
Type
Weed Management-Other Crops/Areas
Information
Weed Technology , Volume 31 , Issue 3 , June 2017 , pp. 470 - 476
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: Ramon G. Leon, University of Florida.

References

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