Source: California Invasive Plant Council


URL of this page: http://www.cal-ipc.org/ip/management/plant_profiles/Carduus_pycnocephalus.php

Carduus pycnocephalus (Italian thistle)

Carduus pycnocephalus
Carduus pycnocephalus
Photo courtesy Joseph DiTomaso

Carduus pycnocephalus (Italian thistle) is a winter annual forb (family Asteraceae) widely distributed in disturbed open sites, roadsides, pastures, annual grasslands, and waste areas in much of California.

Cal-IPC Inventory rating: Moderate

Cal-IPC Resources on Carduus pycnocephalus

Cal-IPC News Articles

  • O'Rourke, B. and J. Horenstein (2009). Tackling invasive plants on California Sept. of Fish & Game lands. Cal-IPC News. 17: 12.
  • (1993). California Exotic Pest Plant Council draft list exotic plants of greatest concern October 1993. CalEPPC News. 1: 6.
  • Dozier, M. (2007). Shasta County citizens take on weeds. Cal-IPC News. 14: 4-5.
  • Kelly, M. (1997). Lessons from the front: Taking stock to avoid surprises. CalEPPC NEWS. 5: 4-7.
  • Massera, J. (2001). More about Italian thistle. CalEPPC News. 9: 14.
  • Pitcairn, M. (2000). All weeds that have approved biological control agents, accidental introductions and others. CalEPPC News. 8.

Cal-IPC Symposium Proceedings

  • Archbald, G. (1998). Mechanical control methods: beyond weed bashing. California Exotic Pest Plant Council Symposium '98. Ontario, CA.
  • Boyd, D. (1997). Eucapyptus removal on Angel Island. California Exotic Pest Plant Council Symposium '97. Concord, CA.
  • Briscoe, E. and T. Anderson (2000). War on weeds - invasive weed education and outreach program. California Exotic Pest Plant Council Symposium 2000. Concord, CA.
  • Clines, J., J. DiTomaso, et al. (2004). Fire working group. California Invasive Plant Council Symposium 2004. Ventura, CA.
  • Guerriero, A. (2002). Monitoring Carduus pycnocephalus (Italian thistle) on grasslands in coastal central California. California Exotic Pest Plant Council Symposium 2002. Sacramento, CA.
  • Pirosko, C. and S. Schoenig (2004). Forbs working group. California Invasive Plant Council Symposium 2004. Ventura, CA.
  • Pitcairn, M. J. and D. M. Woods (1998). Control methods: Biological control. California Exotic Pest Plant Council Symposium '98. Ontario, CA.
  • Pitcairn, M. J. and D. M. Woods (1998). Control methods: biological control. California Exotic Pest Plant Council Symposium 1998. Ontario, CA.

Other Resources on Carduus pycnocephalus