INVADERS - Blackfoot potential weed invasion

	Monday, February 13, 2012



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Blackfoot Drainage New Weeds Risk Assessment

Species Summaries

The following summary is provided for each species on the alert list:

Scientific name
Family
Common name
Continent of origin

Life form
Duration
Growth habit
Propagation
Dispersal

Weeds of the West page: *page number if described in Whitson et al. (1991)

Western states/provinces listing as noxious (any category): state/province names

Montana Weed Seed Free Forage Program: *

Brooklyn Botanic Garden Invasive Plants list: *whether the species is included in the Encyclopedia of Invasive Plants (Randall and Marinelli 1996)

National EPPC list: *whether listed by on the National Association of Exotic Pest Plant Councils "Worst Invasive Plant Species in the Continental United States" (Sept. 1997 update) - species invasive in wildland ecosystems

Pacific NW EPPC status: *from the Pacific Northwest Exotic Pest Plant Council "Non-native Pest Plants of Greatest Concern in Oregon and Washington as of August 1997." The focus of this list is on "the impacts that non-native plants currently have or could have upon wildlands, including natural areas; national, state and community parks; wildlife areas; and all other public lands that have not been highly disrupted by human activities."

* NL = not listed, Y = present on the list

Countries reporting as an agricultural weed: from Holm et al. (1979)

Listed as noxious in Australia?: Parsons and Cuthbertson (1992).

Earliest record in the 5 northwest states: Oregon, Washington, Idaho, Montana and Wyoming - year of first record from the INVADERS Database (Rice 1997)

Number of counties with records in the 5 northwest states as of 1996: from INVADERS

Counties with records in the larger Blackfoot infiltration area as of 1996: the 11-county area analyzed includes the Blackfoot River counties Missoula and Powell, plus the adjacent surrounding counties Mineral, Sanders, Lake, Flathead, Lewis and Clark, Jefferson, Deer Lodge, Granite and Ravalli.

Total number of records in the 11-county Blackfoot infiltration area as of 1996: INVADERS

Comments: susceptible cover types or habitat types if known, other miscellaneous comments

(Literature Cited)

Scientific name: Abutilon theophrasti
Family: Malvaceae
Common name: velvetleaf
Continent of origin: Asia

Life form: forb
Duration: annual
Growth habit: erect
Propagation: seeds
Dispersal:

Weeds of the West page: 382
Western states/provinces listing as noxious (any category): British Columbia, Colorado, Manitoba, Oregon, Washington
Montana Weed Seed Free Forage Program: NL
Brooklyn Botanic Garden Invasive Plants list: NL
National EPPC list: Y
Pacific NW EPPC status: Most invasive - regional
Countries reporting as an agricultural weed: Canada, United States
Listed as noxious in Australia?: N

Earliest record in the 5 northwest states: 1885
Number of counties with records in the 5 northwest states as of 1996: 44
Counties with records in the Blackfoot infiltration area as of 1996: Missoula, Sanders
Total number of records in the 11-county Blackfoot infiltration area as of 1996: 2

Comments: Velvetleaf has been a problem weed primarily on cultivated land, especially in corn and soybeans in the Midwestern U.S. It was first recorded in Montana in 1956 and has been reported as a weed of gardens and disturbed areas. It is not frost hardy and its weed potential in western Montana may be limited.