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Downy Brome (Bromus tectorum) Control with Imazapic on Montana Grasslands

Published online by Cambridge University Press:  20 January 2017

Jane Mangold*
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, 59717
Hilary Parkinson
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, 59717
Celestine Duncan
Affiliation:
Weed Management Services, Helena, MT, 59620
Peter Rice
Affiliation:
Division of Biological Sciences, University of Montana, Missoula, MT, 59812
Ed Davis
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, 59717
Fabian Menalled
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, 59717
*
Corresponding author's E-mail: jane.mangold@montana.edu
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Abstract

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Downy brome is a problematic invasive annual grass throughout western rangeland and has been increasing its abundance, spread, and impacts across Montana during the past several years. In an effort to develop effective management recommendations for control of downy brome on Montana rangeland, we compiled data from 24 trials across the state that investigated efficacy of imazapic (Plateau®, BASF Corporation, Research Triangle Park, NC) applied at various rates and timings and with methylated seed oil (MSO) or a nonionic surfactant (NIS). We ran a mixed-model ANOVA to test for main effects and interactions across application rate (70, 105, 141, 176, and 211 g ai ha−1), application timing (preemergent [PRE], early postemergent [EPOST, one- to two-leaf growth stage], and postemergent [POST, three- to four-leaf growth stage]), and adjuvant (MSO, NIS). Application timing and rate interacted to affect downy brome control (P = 0.0033). PRE imazapic application resulted in the lowest downy brome control (5 to 19%), followed by POST application (25 to 77%) and EPOST application (70 to 95%). Downy brome control remained fairly consistent across rates within application timing. Adjuvant (MSO or NIS) did not affect downy brome control (P = 0.2789). Our data indicate that POST application at 105 to 141 g ai ha−1 provides the most-consistent, short-term control of downy brome. Furthermore, applying imazapic to downy brome seedlings shortly after emergence (one- to two-leaf growth stage) provided better control than applying it to older downy brome seedlings (three- to four-leaf growth stage).

Type
Research
Creative Commons
Creative Common License - CCCreative Common License - BYCreative Common License - NCCreative Common License - SA
This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike licence (http://creativecommons.org/licenses/by-nc-sa/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the same Creative Commons license is included and the original work is properly cited.
Copyright
Copyright © Weed Science Society of America

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