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Fosamine ammonium impacts on the targeted invasive shrub Rhamnus cathartica and non-target herbs

Published online by Cambridge University Press:  05 June 2020

Michael J. Schuster Open the ORCID record for Michael J. Schuster [Opens in a new window] ,
Paul Bockenstedt ,
Peter D. Wragg Open the ORCID record for Peter D. Wragg [Opens in a new window]  and
Peter B. Reich Open the ORCID record for Peter B. Reich [Opens in a new window]
Michael J. Schuster*
Affiliation:
Postdoctoral Associate, Department of Forest Resources, University of Minnesota, St Paul, MN, USA
Paul Bockenstedt
Affiliation:
Project Manager, Stantec Consulting Services Inc, Minneapolis, MN, USA
Peter D. Wragg
Affiliation:
Postdoctoral Associate, Department of Forest Resources, University of Minnesota, St Paul, MN, USA
Peter B. Reich
Affiliation:
Professor, Department of Forest Resources, University of Minnesota, St Paul, MN, USA; and Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW2751, Australia
*
Author for correspondence: Michael J. Schuster, Department of Forest Resources, University of Minnesota, St Paul, MN55108. (Email: [email protected])
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Abstract

Fosamine ammonium (Krenite®) is a foliar herbicide that primarily targets woody plant species; however, formal evaluations of its efficacy and potential for non-target impacts are scarce in the literature. The few tests of fosamine ammonium that exist focus primarily on its use in open environments, and the value of fosamine ammonium in controlling invasive understory shrubs is unclear. Here, we test the impact of fosamine ammonium on invasive common buckthorn (Rhamnus cathartica L.) and co-occurring herbaceous plants across six forest sites in Minnesota, USA. Rhamnus cathartica treated with fosamine ammonium had a 95% mortality rate, indicating high efficacy of fosamine ammonium for use against R. cathartica. Non-target impacts varied between forbs and graminoids such that forb cover was reduced by up to 85%, depending on site, whereas graminoid cover was sparse and impacts of fosamine ammonium on graminoids were unclear. These results indicate that while fosamine ammonium can provide effective control of R. cathartica and other understory shrubs, there is potential for significant non-target impacts following its use. We therefore suggest that land managers carefully consider the timing, rate, and application method of fosamine ammonium to achieve desired target and non-target impacts.

Keywords

Buckthornbud inhibitorefficacyKrenite®non-target effectsherbicideunderstory
Type
Note
Information
Invasive Plant Science and Management , Volume 13 , Issue 3 , September 2020 , pp. 210 - 215
Copyright
© Weed Science Society of America, 2020

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Footnotes

Associate Editor: Rob J. Richardson, North Carolina State University

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