Items of Interest:

Efforts Expand to Eradicate Japanese Beetle in Montana (Jun 19, 2009)
Montana Department of Agriculture.
A team from the Montana Department of Agriculture distributed nearly 500 insect traps and information southeast of Kalispell, where a pair of Japanese beetles were trapped. The green and yellow plastic traps will be monitored bi-weekly by department personnel and will remain in place until the middle of September.

Montana Department of Agriculture Cooperative Pest Survey Report 2008 (PDF | 8 MB)
Montana State University.

Zero Spread
Montana Weed Control Association.
Zero Spread is a major media and educational campaign to promote prevention and management of invasive weeds in the state of Montana.

Find Experts and See State Specific Threats:

Invasive Species Experts - Montana
Aquatic Nuisance Species Task Force.

Nonindigenous Species List - Montana or Display Species List by Taxonomic Group (select State)
DOI. USGS. Florida Integrated Science Center.
Includes fact sheets, maps and collection information.

State Noxious Weed List - Montana
USDA. NRCS. National Plant Data Center. PLANTS Database.
Designated legally noxious plants.

Pest Tracker - Montana
USDA. APHIS. Cooperative Agricultural Pest Survey. National Agricultural Pest Information System.

Forest Threat Summary Viewer - Montana
USDA. FS. Eastern Forest Environmental Threat Assessment Center.
See what threats (invasive plants, insects and diseases) are in my state.