Alameda-Contra Costa Weed Management Area
WMAs are local stakeholder groups working on weed projects. Typically, they are organized by county, through county Agricultural Commissioners' offices. All interested land management entities, public and private, are invited to participate. Official WMA partners sign a Memorandum of Understanding indicating their commitment to working on invasive plant problems to the extent resources allow. Each WMA develops a strategic plan that identifies their top priorities for local management. Together these partners plan and implement projects on-the-ground, and collaborate on mapping and public education. In the year 2000, there were fewer than 20 groups statewide—today there are 48 covering all counties.

Edmund Duarte
Alameda County Department of Agriculture
3575 Greenville Rd, Livermore, CA 94550 
(925) 245-0849,

Meetings: Four to six times a year. The meetings alternate between Contra Costa County Department of Agriculture and Alameda Department of Agriculture Field Office. 
Formed: 1998

Project Highlights:

  • Integrated yellow starthistle management in Alameda County 
    • This project is located in South/Eastern Portion Alameda County and focuses on purple starthistle and Yellow Starthistle. The area treated covers 2,004 acres. Methods are control are chemical, cultural and burning. Open Space, wild lands and grazing lands are being protected through this endeavor. Project partners: Public and Private Landowners
  • Alameda & Contra Costa Counties yellow starthistle Project
    • This project combines the efforts of both counties to cover 300,000 acres. Yellow starthistle is being controlled through the release of biological control agents; Bangasternus orientalis, Eustenopus villosus, Urophora sirunaseva, Chaetorellia succinea. Reductions of invasive yellow starthistle populations in open space and grazing lands with the aid of yellow starthistle natural predators. Project partners: Private and Public Landowners.
  • Integrated yellow starthistle Management in Contra Costa County
    • The focus of this project is Tassajara Creek & Alhambra Creek Watersheds, which covers 4350 acres. By controlling yellow starthistle grazing lands and open space are being preserved. Methods of control are chemical and cultural. Project partners: Private and Public Landowners. 
  • Noxious weed control in Tilden Regional Park
    • Twenty acres are being controlled from various weeds (i.e. leafy spurge and Scotch Broom) in the East Bay Regional Park District. The methods for control are non-chemical. Goals are the protections of park land by removal of invasive species, 3 workshops for vegetation/Land managers. Project partners: Public and Private Landowners. 
  • Wavy-Leaved Gaura, Barbed Goatgrass removal
    • Area being treated are Camp Parks, Marciel Ranch, Alameda County, about 300 acres. Species controlled in this endeavor are Wavy Leaved Guara and Barbed Goatgrass, through chemical and mechanical treatments. Strategic goals are to protecting open space & grazing lands by removal of locally distributed invasive species: Private and Public Landowners.

Contact Alameda-Contra Costa Weed Management Area

Cathy Roybal
Contra Costa County Department of Agriculture
2366A Stanwell Circle
Concord, California  94521
Phone: 925-646-5250


Service Area

Services provided in:
  • Alameda County, California
  • Contra Costa County, California

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