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Ecology and Management of Flowering Rush (Butomus umbellatus L.)
Invasive Species Technical Note Number MT-33
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Invasive Species Technical Note Number MT-33 (PDF; 332 KB)
September 2011
By Jim Jacobs, Plant Materials Specialist, USDA-NRCS, Bozeman, Montana
Jane Mangold, Extension Invasive Plant Specialist, Montana State University,
Bozeman, Montana
Hilary Parkinson, Research Associate, Montana State University, Bozeman, Montana
Virgil Dupuis, Salish Kootenai College, Pablo, MT
Peter Rice, Research Ecologist, University of Montana, Missoula, MT
![Flowering rush restricting flow in an irrigation ditch in Lake County, Montana](https://webarchive.library.unt.edu/web/20130225191726im_/http://www.mt.nrcs.usda.gov/technical/images/invasiveimages/InvasiveTN33/Invasive_tn33_1.png)
Figure 1. Flowering rush restricting flow in an irrigation ditch in Lake County,
Montana. Photo by Alvin Mitchell, Salish Kooteani College, Pablo, Montana.
Abstract
Flowering Rush is an invasive Eurasian aquatic plant resembling a large sedge
with emerged and fully submerged forms and umbrella-shaped clusters of 20 to 50
light-pink to rose-colored flowers. The fleshy rhizomatous roots fragment by
minor disturbances and spread populations long distance by floating on water
currents. It grows along lake shores and slow moving bodies of water. In Montana
it is currently reported along the shores of Flathead Lake, portions of the
Flathead River, Thompson Falls Reservoir, Noxon Reservoir, Cabinet Gorge and the
Clark Fork River. Dense populations growing within irrigation ditches reduce
water availability and flow (see Figure 1), and dense populations along lake
shores inhibit boating, fishing, and swimming. Control methods are currently
limited to hand and mechanical digging and herbicide application after water
drawdown (check local regulations before applying these managements). Chemical
control method studies are ongoing. Prevention, early detection and rapid
response to eradicate new populations are the management priorities for Montana.
Consult your county weed coordinator for the best management options for your
area. New populations should be reported to county Extension agents or weed
coordinators.
- Identification
- Life History
- Habitat
- Spread
- Impacts
- Prevention
- Mechanical Control
- Cultural Control
- Chemical Control
- Biological Control
- Integrated Pest Management (IPM)
References
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http://invader.dbs.umt.edu.
Rice, P. and V. Dupuis. 2009. Flowering rush: and invasive aquatic macrophyte
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Invasive Plant Management (CIPM).
http://www.weedcenter.org/projects-spatial.html.
Tabor, R.A., R.S. Shively, and T.P. Poe. 1993. Predation on juvenile salmonids
by smallmouth bass and northern squawfish in the Columbia River near Richland,
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