Lake County, Montana

Weed Control
Montana Noxious Weed List
Priority 1A:These weeds are not present or have very little presence in Montana. Management criteria will require eradication if detedted; education; and prevention.
•Yellow starthistle (Centaurea solstitialis)

•Dyer's woad (Isatis tinctoria)

•Common reed (Phragmites australis ssp. australis)
•Medusahead (Taeniatherum caput-medusae

Priority 1B:These weeds have limited presence in Montana. Management criteria will require eradication or containment and education.
•Blueweed (Echium vulgare) •Rush skeletonwed (Chondrilla juncea)
•Scotch broom (Cytisus scoparius) •Purple loosestrife (Lythrum spp.)
•Knotweed complex (Polygonum cuspidatum, P. sachalinense, P. x bohemicum, Fallopia japonica, F. sachalinensis, F. x bohemica, Reynoutria japonica, R. sachalinensis, and R. x bohemica)

Priority 2A:These weeds are common in isolated areas in Montana. Management criteria will require eradication or containment where less abundant. Management shall be prioritized by local weed districts.
•Tansy ragwort (Senecio jacobaea) •Tall buttercup (Ranunculus acris)
•Flowering rush (butomus umbellatus) •Perennial pepperweed (Lepidium latifolium)
•Meadow hawkweed complex (Hieracium spp.) •Yellowflag iris (Iris pseudacorus)
•Orange hawkweed (Hieracium aurantiacum) •Ventenata (Ventenata dubia)
•Eurasian watermilfoil (Myriophyllum spicatum, Myriophyllum spicatum x, Myriophyllum sibricum)  

Priority 2B:These weeds are abundant in Montana and widespread in many counties. Management criteria will require eradication or containment where less abundant. Management shall be prioritized by local weed districts.
•Canada thistle (Cirsium arvense) •Russian Knapweed (Acroptilon repens)
•Field bindweed (Convolvulus arvensis) •Spotted Knapweed (Centaurea stoebe)
•Common tansy (Tanacetum vulgare) •St. Johnswort (Hypericum perforatum)
•Saltcedar (Tamarix spp.) •Sulfur Cinquefoil (Potentilla recta)
•Houndstongue (Cynoglossum officinale) •Whitetop (Cardaria draba, Lepidium draba)
•Leafy Spurge (Euphorbia esula) •Yellow Toadflax (Linaria vulgaris)
•Oxeye Daisy (Leucanthemum vulgare) •Diffuse knapweed (Centaurea diffusa)
•Curlyleaf pondweed (Potamogeton crispus •Dalmatian toadflax (Linaria dalmatica)
•Hoary alyssum (Berteroa incana) •Common buckthorn (rhamnus cathartica L.)

Priority 3: Regulated Plants: (NOT MONTANA LISTED NOXIOUS WEEDS) These regulated plants have the potential to have significant negative impacts. The plants may not be intentionally spread or sold other that as a contaminant in agricultural products. The state recommends research, education and prevention to minimize the spread of the regulated plant.
•Cheatgrass (Bromus tectorum) •Hydrilla (Hydrilla verticillata)
•Russian olive (Elaeagnus angustifolia) •Brazilian waterweed (Egeria densa)
•Parrot feather watermilfoil (myriophyllum aquaticum or M. brasiliense



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