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

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

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.

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

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