Medusahead and Ventenata in the Northern Great Plains Ecoregion: Invasion History and Management Efforts

Medusahead and Ventenata in the Northern Great Plains Ecoregion: Invasion History and Management Efforts

The invasive winter annual grasses medusahead (Taeniatherum caput-medusae) and ventenata (Ventenata dubia) have a relatively long history of spread and impact in the Intermountain West. In 2016, self-sustaining populations of both species were documented in Sheridan County, Wyoming, representing the first known populations of each species in the Great Plains region.

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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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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.


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.  


Secondary Invasion and Reinvasion after Russian-Olive Removal and Revegetation


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,

Photo by Chuck Bargeron, University of Georgia,

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 

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.  

First report: spotted knapweed (Centaurea stoebe) resistance to auxinic herbicides

Spotted knapweed is a prohibited noxious weed that is primarily controlled with auxinic herbicides. A population collected from a managed rangeland in East Kootenay, BC, was highly resistant to both clopyralid and picloram, with R/S ratios of >25 600 and 28, respectively. This is the first report of resistance in spotted knapweed.

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