- 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.
Free copies are available at Central Sierra local Extension Offices. Or Click image for eBook.