centaurea solstitialis

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• - 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.
  
• - 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.
  
• - USDA site reports positive results on field tests using Eustenopus villosus weevils to control starthistle in Idaho.
  
• - The plant's origins and biology, current infestation levels in Washington, extensive list of print references. From the Washington State Noxious Weed Control Board.
  
• - 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.
  
• - 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.
  
• - Overview of biology and origins, plus more extensive discussion of control options. From El Dorado County, California.
  
• - Photograph and description from the Colorado Weed Management Association, indicating that it is not yet a serious problem in Colorado.