Monday, January 21, 2019
Blackfoot Challenge Weed Management Area
Integrated Weed Management

Potential Exotic Plant Species Invading the Blackfoot Drainage

Peter Rice, Chris Toney and Bob Sacco, December 1997

Preface and Goals:
     The Blackfoot Challenge is developing and implementing integrated management plans for several well known weeds, declared noxious by the State of Montana, that  are currently problem plants in the Blackfoot River drainage, west-central Montana. These wide-spread noxious weeds include leafy spurge, Dalmatian toadflax, spotted knapweed, sulfur cinquefoil, and Saint Johnswort.
     The task of the INVADERS work group  was to identify additional exotic plant species that have the potential to become significant problem weeds over the next five decades in the Blackfoot drainage. Professional awareness of new invaders and early detection are the essential prerequisites for any successful eradication or containment action. The cost-benefit ratio is optimized by intervention during the initial phases of spread of a weed species.

New Invaders Alert List, Risk Ratings, & Identification Information
Dirty Dozen (Old Weeds), including identification information
Species selection and assessment of weed potential
Specific objectives for the 1997 project year
Download the 1997 project report

Suggested multi-year efforts:

The principal multi-year goal of the early detection and prevention components of an integrated weed management plan is to empower land managers to eradicate or contain new invaders  before they can become widespread and permanent members of the local plant communities. Obtaining this goal would involve seven overlapping steps:

1. The creation of an alert list. 

2. Determination of environments susceptible to invasion.

3. Determine characteristics necessary to identify these new invaders in the field, prepare training materials (herbarium mounts, photos, key field character tables) and conduct  short courses to teach local land managers how to recognize these less well known weed species.

4. Conduct cooperative surveys of the Blackfoot River Basin and surrounding areas to locate example colonies for training, determine the current magnitude of the problem, and provide the mapping information necessary to implement control action if deemed prudent.

5. Provide managers with tactics and methods for eradication or containment of these species.

6. Implement the control actions.

7. Monitor the response of these target colonies.


Annual schedule for an early detection and prevention program
  1997 1998 1999 2000 2001 2002
Alert list            
Susceptible environments          
ID training        
Recon and map      
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pages last revised: January 27, 2000