Monday, January 21, 2019

 Blackfoot Drainage New Weeds Risk Assessment

Well-Known and/or Old Weeds (Dirty Dozen)

A list of well-known or old weeds, commonly known as Dirty Dozen, was also produced. These species had established in the northwestern United States by the 1930's and are well described in the weed management literature. It is comprised of:

(1) Category 2 or 3 noxious weeds in Montana that have been reported in the past in the project area, but that are presently not widespread, or, are believed to have been eradicated: these species have high potential to become significant problem plants unless new occurrences are detected early and eradicated, and

(2) well-known weeds that are relatively common but not presently noxious in Montana.  Some of these latter species may be declared noxious in the future.

Note: The "more info" column has the following links: 
   - distribution data for the five northwestern states (executes a query on the INVADERS Database) 
   - a list of related links on the web
    - view the list of states/provinces where this weed is declared noxious

Artemisia absinthium absinth wormwood
Noxious Status
Centaurea solstitialis yellow starthistle
Chondrilla juncea rush skeletonweed
Chrysanthemum leucanthemum oxeye daisy
Conium maculatum poison hemlock
Cynoglossum officinale houndstongue
Cytisus scoparius scotch broom
Dipsacus fullonum common teasel
Isatis tinctoria dyer's woad
Lythrum salicaria purple loosestrife
Senecio jacobaea tansy ragwort
Tanacetum vulgare common tansy

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