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Control of downy brome (Bromus tectorum) and Japanese brome (Bromus japonicus) using glyphosate and four graminicides: effects of herbicide rate, plant size, species, and accession

Published online by Cambridge University Press:  05 November 2019

Emily P. Metier ,
Erik A. Lehnhoff ,
Jane Mangold ,
Matthew J. Rinella  and
Lisa J. Rew Open the ORCID record for Lisa J. Rew [Opens in a new window]
Emily P. Metier
Affiliation:
Graduate Research Assistant, Department of Land Resources and Environmental Science, Montana State University, Bozeman, MT, USA
Erik A. Lehnhoff
Affiliation:
Assistant Professor, Department of Entomology, Plant Pathology and Weed Science, New Mexico State University, Las Cruces, NM, USA
Jane Mangold
Affiliation:
Associate Professor, Department of Land Resources and Environmental Science, Montana State University, Bozeman, MT, USA
Matthew J. Rinella
Affiliation:
Range Management Specialist, USDA-ARS Fort Keogh LARRL, Miles City, MT, USA
Lisa J. Rew*
Affiliation:
Professor, Department of Land Resources and Environmental Science, Montana State University, Bozeman, MT, USA
*
Author for correspondence: Lisa Rew, Montana State University, Department of Land Resources and Environmental Science, 334 Leon Johnson Hall, P.O. Box 173120, Bozeman, MT59717-3120. (Email: [email protected])
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Abstract

Nonnative annual brome invasion is a major problem in many ecosystems throughout the semiarid Intermountain West, decreasing production and biodiversity. Herbicides are the most widely used control technique but can have negative effects on co-occurring species. Graminicides, or grass-specific herbicides, may be able to control annual bromes without harming forbs and shrubs in restoration settings, but limited studies have addressed this potential. This study focused on evaluating the efficacy of glyphosate and four graminicides to control annual bromes, specifically downy brome and Japanese brome. In a greenhouse, glyphosate and four graminicides (clethodim, sethoxydim, fluazifop-P-butyl, and quizalofop-P-ethyl) were applied at two rates to downy brome plants of different heights (Experiment 1) and to three accessions of downy brome and Japanese brome of one height (Experiment 2). All herbicides reduced downy brome biomass, with most effective control on plants of less than 11 cm and with less than 12 leaves. Overall, quizalofop-P-ethyl and fluazifop-P-butyl treatments were most effective, and glyphosate and sethoxydim treatments least effective. Accessions demonstrated variable response to herbicides: the downy brome accession from the undisturbed site was more susceptible to herbicides than downy brome from the disturbed accession and Japanese brome accessions. These results demonstrate the potential for graminicides to target these annual bromes in ecosystems where they are growing intermixed with desired forbs and shrubs.

Keywords

Glyphosatequizalofop-P-ethylfluazifop-P-butylclethodimsethoxydimdowny brome, Bromus tectorum L.Japanese brome, Bromus japonicus HouttAnnual brome controlcheatgrassrestorationweed management
Type
Research Article
Information
Weed Technology , Volume 34 , Issue 2 , April 2020 , pp. 284 - 291
Copyright
© Weed Science Society of America, 2019

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Footnotes

Associate Editor: Michael Walsh, University of Sydney

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