- California Department of Food and Agriculture Noxious Weed Programs and "Encycloweedia" - Notes on identification, biology, and management of plants defined as noxious weeds by California laws.
- El Dorado County Invasive Weed Management Program - Describes the county's noxious weed programs and includes links to a number of weed-related sites.
- Identification: Weed Photo Gallery - The UCIPM Weed Photo Gallery includes many weed species found in California farms & landscapes. More species will be added from time to time.
- Yellow Starthistle Guidelines - Identification, Biology,and Management from UC Integrated Pest Management Website.
- Weed Research and Information Center UCD - An interdisciplinary collaboration that fosters research in weed management and facilitates distribution of associated knowledge for the benefit of agriculture and for the preservation of natural resources.
- California Invasive Plant Council - Cal-IPC provides science-based tools and information to help land managers and others make the best choices for California.
UCCE Central Sierra
