Weed Prevention Areas: Protecting Montana from Invasive Weeds
Interrupt weed movement

To reduce introductions, prevention actions in WPAs target weed spread as a factor of human activity. Examples of human-related pathways include vehicular transportation, recreation, and importation of contaminated forage, crop seed, soil, gravel, and other materials. The prevention practices in WPAs are also specific to the behavior of the invading plants in the invasion process. For instance, exhaustive monitoring is conducted along roads for weeds, such as spotted knapweed (right), that rely on transportation corridors to gain access to new regions (below).

road with adjacent large spotted knapweed infestation
The continuously disturbed areas adjacent to roads and increased water from pavement runoff can provide ideal habitat for weeds like spotted knapweed.


spotted knapweed
Spotted knapweed Photo: J. Cardina, Ohio State University, Bugwood.org

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