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2010 "Volunteers Working With Invasives"
Grants Report Form

Display Report


Project Title: Bull thistle, Musk thistle, and Common Teasel Eradication and Prevention
Region: 6
Station: Ouray NWR
Contact Person:
Name and Phone Number
Diane Penttila 435-545-2522 x 12
Project Description:
(Up to 250 words)
In 2004 through 2007, a Refuge-wide inventory was conducted to determine the extent of known weeds and to look for new weeds. From this inventory, bull thistle was discovered. At that time a total of 2.0 acres was found scattered throughout the Refuge in small patches. Since the discovery of bull thistle the Refuge has been aggressive in its attempts to eliminate bull thistle. In 2008, very little bull thistle was found, but in 2009, several new patches were discovered, including some larger patches in on bottom area. In addition, musk thistle was also found in 2009 in the same bottom area. In 2010, a re-inventory needed to be conducted in that bottom area to map the extent of bull thistle and look for musk thistle. Common teasel currently does not occur on the Ouray NWR. However it occurs on the Green River upriver from the Refuge. The Uintah Basin Cooperative Weed Management Area has aggressively pursued control of common teasel on the River. The Ouray NWR weed crew has assisted with this control in attempts to stop the spread of common teasel.
List of Invasives Species Targeted:Common NameScientific Name
  Bull thistle Cirsium vulgare
Musk thistle Carduus nutans
Common teasel Dipsacus fullonum
Project Status: Completed
Project Completion Date
or Estimated Completion Date:


Volunteer Affiliation:
(Check all that apply)
                    VA_StudentConsAssoc            VA_Other
Volunteer Involvement:
Describe the type of work the volunteers performed. (Up to 150 words)
A weed re-inventory was conducted in two areas of Leota Bottom to search for expanding bull thistle and musk thistle as well as re-inventoring existing weeds already known. All past bull thistle and musk thistle locations were throughly searched and when thistle was found, the flowers removed and the plant chemically treated. The weed crew and volunteers assisted in common teasel removal from the Green River by mechanical removal of the plant.
Total Number of Volunteers: 2
Total Number of Volunteer Hours: 200
List both new and existing partnerships utilized in this project. (Up to 150 words).
Student Conservation Association, Uintah Basin Cooperative Weed Management Area.


Project Results:
Give an overview of the results of the project. Include quantifiable measure of success, such as maps produced, efficacy of control measures, number of sites where invasions were detected early and responded to, number of community contacts, etc. (Up to 250 words).
Over 200 acres were inventoried for bull thistle and musk thistle. Over 65 sites with past bull thistle and musk thistle treatment were throughly searched. Past control efforts were very successful with very little bull thistle and no musk thistle found. The Ouray NWR weed crew assisted with common teasel removal along the Green River by mechanical removal. Past removal efforts along the A section of the River have been successful with very little teasel found in 2010. Removal continued in the B section and C section. Dinosaur National Monument in downriver from the C section and has found and removed very little teasel. The Refuge was also searched for teasel along the Green River but none was found.
Number of Acres Treated: 5
Number of Acres Inventoried and/or Mapped: 300
Number of Acres Restored: 200


Budget: Account for funds in broad categories such as equipment, volunteer stipends, travel, coordinator salary/contract, etc.

Total Grant Amount:

$ 5,000

Breakdown of Expenditures:


Total $ Spent
% of Total Grant
Equipment / Supplies 400 8
Chemical 950 19
Biocontrol Agents
Volunteer Stipends
Volunteer Coordinator Salary/Contract 3,650 73
Restoration Materials

Recommendations: (OPTIONAL)
How useful was this program for meeting refuge invasive species objectives and how can it be improved?
This funding allowed us to complete a much needed inventory of a large area. We also were very successful in continued elimination of bull and musk thistle. We were able to assist with rental of rafts and crew for continued control of common teasel in a cooperative effort that has seen successful results.


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