Photograph and description from the Colorado Weed Management Association, indicating that it is not yet a serious problem in Colorado.

Stewardship document provides history of the plants' migration from Eurasia to the Americas, biological description, associated ecological problems, management tactics, extensive bibliography and several detailed photographs. From The Nature Conservancy.

Photographs and information about the origins of the plant and the problems it causes. Analysis of several control measures. From University of California Cooperative Extension.

USDA site reports positive results on field tests using Eustenopus villosus weevils to control starthistle in Idaho.

Overview of biology and origins, plus more extensive discussion of control options. From El Dorado County, California.

The plant's origins and biology, current infestation levels in Washington, extensive list of print references. From the Washington State Noxious Weed Control Board.

University of California guidelines for control of Yellow Starthistle, including identification and biology.

Origins, life cycle, photographs, and analysis of several means of controlling this pest.

Extensive site provides detailed information about the weed, including origins, impacts, biology, management options, associated legislation and references. From the UC Davis Weed Research and Information Center.