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Weed ID What is a Noxious Weed? Noxious weeds are defined as being any exotic plant species which may render land unfit for agriculture, forestry, livestock, wildlife or other beneficial uses or that may harm native plant communities. Click here for plant definitions. Click here to find out what weeds are in your area Group 1 Noxious weeds are currently established and are generally widespread throughout Missoula County. The management criteria for Group 1 noxious weeds include awareness, education, preventing establishment in areas not infested with the noxious weed, and reducing weed populations in designated Weed Management Areas and road right-of-ways. Group 1 noxious weeds have invaded more than 5,000 acres in Missoula County and include:
Group 2 Noxious weeds have recently been introduced or are rapidly spreading from their current infestation. Management criteria include awareness, education, prevention, and containment of existing infestations. Group 2 noxious weeds have invaded more than 1,000 acres in Missoula County and include:
Group 3 Noxious weeds are small infestations located in limited areas. Management criteria include prevention, awareness, education, early detection, mapping, and eradication. Group 3(a) noxious weeds infest less than 1,000 acres and include:
Group 4 Noxious weeds have not been detected in Missoula County. Management criteria include prevention, awareness, education, detecting, mapping and eradicating infestations in the first year of establishment and include:
Watch List Weeds are small infestations of weeds located in limited areas. Management criteria include prevention, awareness, education, early detection, mapping, and eradication.
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