Forest Roads Facilitate the Spread of Invasive Plants

Photo by Chuck Bargeron, University of Georgia, Bugwood.org

Photo by Chuck Bargeron, University of Georgia, Bugwood.org

David A. Mortensen and others. Invasive Plant Science and Management 2(3):191-199.

This large-scale survey highlights the importance of roads in predicting the presence of invasive plants, also revealing that one invasive plant, Japanese stiltgrass (Microstegium vimineum), has spread rapidly since its introduction. READ FULL ABSTRACT HERE 

Plains Cottonwood’s Last Stand: Can It Survive Invasion of Russian Olive onto the Milk River, Montana Floodplain?

www.mt.nrcs.usda.gov

www.mt.nrcs.usda.gov

Pearce and Smith. 2001. Environmental Management Vol. 28, No. 5, pp. 623–637

The eventual replacement of native plains cottonwood (Populus deltoides) forests by Russian olive (Elaeagnus angustifolia) is a serious threat to biodiversity on floodplains in western North America. Low palatability  of Russian olive saplings and trees, easily dispersed seed, and three-year seed viability give Russian olive a competitive advantage over native woody riparian plants. Read entire article here.

Propagule pressure and environmental conditions interact to determine establishment success of an invasive plant species, glossy buckthorn (Frangula alnus), across five different wetland habitat types

Berg, J.A., Meyer, G.A. & Young, E.B. Biol Invasions (2016) 18: 1363. Brief Abstract.

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Many invasive plant species are able to establish within a wide range of community types. This study aimed to investigate interactions between propagule pressure and environmental resistance to seedling recruitment of the invasive shrub, glossy buckthorn (Frangula alnus Mill.), over a range of wetland habitat types. Results showed that drier habitats supported more woody species and provided more raised hummock surfaces essential for successful buckthorn recruitment and establishment; and provides empirical evidence that environmental resistance can be overcome by higher propagule pressure.

READ THE FULL ABSTRACT.

Revegetation 4 Years After Russian Olive Removal Along the Yellowstone River in Eastern Montana

By: J. M. Muscha, M. K. Petersen,   R. W. Kilian, J. D. Scianna, and E. K. Espeland

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Many riparian areas along the Yellowstone River and other rivers in the West have converted to dense Russian olive stands, reducing agricultural and ecological value of these lands.  A study was initiated in 2010 along the Yellowstone River in Montana to determine if restoration was necessary following Russian olive removal, and then establish the effectiveness of four restoration strategies.  Results of the study after four years indicate that herbaceous seeding with planted shrubs had the lowest cover of invasive annual grass.  Native species are continuing to establish at the site, and seeded herbaceous species cover is continuing to increase over time. 

READ MORE DETAILS REGARDING STUDY METHODS AND RESULTS. 

Autumn Olive (Elaeagnus umbellata) Presence and Proliferation on Former Surface Coal Mines in Eastern USA.

By: Oliphant, A.J., Wynne, R.H., Zipper, C.E. et al. Biol Invasions (2017) 19: 179. doi:10.1007/s10530-016-1271-62017.

Autumn olive (Elaeagnus umbellata)

Autumn olive
(Elaeagnus umbellata)

The invasive shrub autumn olive (Elaeagnus umbellata) occurs on former surface coal mines in the Appalachian Mountains interfering with ecosystem recovery by outcompeting native trees.  Results showed that autumn olive could be mapped using Landsat 8 Operational Land Imager imagery.  READ THE FULL ABSTRACT.  

Safety in Drones

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Are you using or considering the use of drones for invasive plant survey and control?  If so, you may want to subscribe to a free biweekly newsletter created as part of Aircraft Owners and Pilots Association effort to promote safety and education for all airspace users, including drone pilots.

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Cattle Grazing Effects on Phragmites australis in Nebraska

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Authors: Jerry D. Volesky, Stephen L. Young, and Karla H. Jenkins (2016) Invasive Plant Science and Management: April-June 2016, Vol. 9, No. 2, pp. 121-127.
Phragmites australis (common reed) is a widely established invasive plant in wetlands and riparian areas. A three-year study was initiated in Nebraska to evaluate targeted cattle grazing, herbicide effects, and the nutritive value of this species. Results suggest that cattle will utilize Phragmites, and the cumulative effect of grazing has the potential to reduce P. australis populations. However, other methods would have to be used for greater control and site restoration. READ FULL PAPER.

Invasibility of three major non-native invasive shrubs and associated factors in Upper Midwest U.S. 2016.

By KEITH MOSER AND OTHERS.

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Three invasive shrubs, multiflora rose, non-native bush honeysuckles, and common buckthorn, were found to have significantly increased in presence and expansion. Resource managers and planners are encouraged to prescribe control and mitigation treatments for non-native invasive plants by forest types and spatial locations close to highways and residences. READ ARTICLE.

Invasive Russian Knapweed (Acroptilon repens) Creates Large Patches Almost Entirely by Rhizomic Growth. 2017.

By JOHN GASKIN AND JEFF LITTLEFIELD.

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Research results indicate that expansion of Russian knapweed patches is almost entirely by rhizomes with long-distance dispersal by seed. Controlling seed development may be effective at stopping long-distance dispersal, but treatment methods that control roots are needed to affect expansion of existing patches. READ ARTICLE.

Invasion Shadows: The Accumulation and Loss of Ecological Impacts from an Invasive Plant (Japanese stiltgrass), 2017.

By Daniel R. Tekiela and Jacob N. Barney.

This article describes how the impact of weedy plants can linger for years.  Newly established invasive populations don’t produce the same level of lingering legacy effects as those that are long established, making early eradication imperative.  READ THE FULL ABSTRACT.