Eastern Mediterranean region (Winston et al. 2012)
1800s (Wolfson et al. 2005)
Introduced accidentally through contaminated seed (Zouhar 2001)
Reduces agricultural yields and forage values; crowds out native species (Winston et al. 2012)
University of Georgia. Center for Invasive Species and Ecosystem Health.Provides state, county, point and GIS data. Maps can be downloaded and shared.
The section below contains highly relevant resources for this species, organized by source. Or, to display all related content view all resources for Diffuse Knapweed.
Council or Task Force
Washington State Recreation and Conservation Office. Washington Invasive Species Council.
USDA. FS. Forest Health Technology Enterprise Team.
State and Local Government
Wisconsin Department of Natural Resources.
Integrated Taxonomic Information System. Centaurea diffusa. [Accessed Sep 10, 2014].
Winston, R., M. Schwarzlander, C.B. Randall, and R. Reardon. 2012. Biology and biological control of knapweeds (PDF | 45.4 MB) (FHTET-2011-05) U.S. Forest Service Forest Health Technology Enterprise Team.
Wolfson, B.A., T.E. Kolb, C.H. Sieg, and K.M. Clancy. 2005. Effects of post-fire conditions on germination and seedling success of diffuse knapweed in northern Arizona. Forest Ecology and Management 216(1-3):342-358.
Zouhar, K. 2001. Centaurea diffusa. In: Fire Effects Information System. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory.