About Weeds

In Calaveras County, there are currently five "A" rated weed pests under eradication. County operated eradication projects include Scotch Thistle, Spotted Knapweed, Spotted-diffuse knapweed, Diffuse knapweed, and Plumeless Thistle. CDFA has eradicated the water weed Hydrilla from waterways within Calaveras County.


Stink Wort a New Calaveras Noxious Weed

University of California Statewide Integrated Pest Management Program (UC IPM) 

Established in 1979, the University of California Statewide Integrated Pest Management Program (UC IPM) develops and promotes the use of integrated, ecologically sound pest management programs in California. This is a very useful website with pest pictures, crop specific pests, pest biology and control information.


Across California, invasive plants damage wildlands. Invasive plants displace native plants and wildlife, increase wildfire and flood danger, consume valuable water, degrade recreational opportunities, and destroy productive range and timber lands. Cal-IPC works with land managers, researchers, concerned citizens, and policy makers to protect the state from invasive plants. The Department works closely with Cal-IPC eradicating targeted species and updating its website "CalWeedMapper".

California Native Plant Society (CNPS)

The California Native Plant Society (CNPS) is a non-profit organization dedicated to the understanding and appreciation of California's native plants and to conserve them and their natural habitats through education, science, advocacy, horticulture and land stewardship.

California Poison Control System (CPCS)

The California Poison Control System (CPCS) is the statewide provider of immediate, free and expert treatment advice and assistance over the telephone in case of exposure to poisonous, hazardous or toxic substances. Call us toll-free, 24 hours a day, 7 days a week, 365 days a year.