What are the Top 50 Invasive Species in the West

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Invasive species pose an enormous environmental challenge to western states and territories. Western Governors have experienced first-hand how these invaders affect the region’s forests and rangelands, water, and agriculture. Left unchecked, invasive species permanently alter ecosystems and negatively impact the native species and local economies that depend upon them.


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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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USFWS – Online training modules for refuge staff

USFWS – Online training modules for refuge staff

The learning modules present science-based concepts and principles integral to understanding management, and illustrating practices implemented by the Refuge System and other land management entities, and provide a basic foundation from which to build knowledge about invasive plant management. More in-depth information of module topics can be acquired by exploring the provided references and resources.

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Weed Seed Dispersal by Vehicles

Weed Seed Dispersal by Vehicles
Understanding weed seed transport by vehicles is important to help direct prevention activities (wash stations, road closures, public education, etc.) to reduce weed seed dispersal along trails and roads. Studies conducted by Montana State University measured the number and type of seeds picked up by vehicles and the distance seeds were transported.Read More