Developing a Detection Method for New Invaders at the Landscape Scale

The ability to predict plant invasions and detect them early in the process are important considerations for invasive plant management. While agencies and landowners typically take the approach of on-the-ground searches and some may utilize habitat suitability models, these tools may not facilitate detection of incipient infestations when the species is unknown. A team set out to develop a method to identify where to look for a new invader to assist managers in focusing search efforts to areas more prone to invasion.

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Timing Aminopyralid to Prevent Seed Production Controls Medusahead (Taeniatherum caput-medusae), and Increase Forage Grasses

Timing Aminopyralid to Prevent Seed Production Controls Medusahead (Taeniatherum caput-medusae), and Increase Forage Grasses

Exotic annual grasses such as medusahead [Taeniatherum caput-medusae (L.) Nevski] and downy brome (Bromus tectorum L.) dominate millions of hectares of grasslands in the western United States. Applying picloram, aminopyralid, and other growth regulator herbicides at late growth stages reduces seed production of most exotic annual grasses.

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Canada Thistle Affects Herbage Production in the Northern Great Plains

Canada thistle can cause greater than 50% yield loss in small grain crops, but little is known about production losses when the weed invades pasture and wildlands. Change in grass, forb, and woody species production from Canada thistle infestations was evaluated in two separate studies in North Dakota.

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Constructing Standard Invasion Curves from Herbarium Data—Toward Increased Predictability of Plant Invasions

by Pedro M. Antunes and Brandon Schamp. Invasive Plant Science and Management, 10(4):293-303. 2017.

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Is it possible to predict which nonnative plant species will become invasive weeds and when? Authors explore challenges related to developing invasion curves for plants using herbarium data.  The goal is to better position herbaria and researchers to assist natural resource managers in prioritizing needs, supporting management decisions and developing prevention and monitoring programs.  

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Secondary Invasion and Reinvasion after Russian-Olive Removal and Revegetation

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Erin K. Espeland, Jennifer M. Muscha, Joseph Scianna, Robert Kilian, Natalie M. West, and Mark K. Petersen. Invasive Plant Science and Management October-December 2017 Vol. 10, No0. 4: 340-349.

Cut-stump application of triclopyr provided 96% control of Russian olive the year following treatment.  Seeded native species did not have trouble establishing once adequate spring moisture occurred in the second growing season after Russian-olive removal, indicating that removal did not present substantial obstacles to successful revegetation. Follow-up control of Russian-olive is critical after initial treatment. [ READ FULL ABSTRACT. ]

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.

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