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Weeds on the Public Lands 


California Interagency
Noxious Weed
Coordinating Committee

Last Updated October 26, 1998

weed graphic
Information on MOU signatories and representatives
  • Copy of the Noxious Weed MOU
  • Noxious weeds are increasingly becoming a problem on forestlands, rangelands, agricultural lands, and wetlands throughout California. The negative impacts from weed infestations are extensive and often irreversible. Weed infestations reduce wildlife habitat, wildlife and livestock forage, and recreational values, while increasing erosion and altering the hydrologic and fire regimes. The greatest single negative impact on native vegetation diversity is the continual rapid spread of exotic noxious weeds. This "explosion in slow motion" is out of control on many Federal, State, and private lands. One common invasive weed, yellow starthistle (Centauria solstitialis), which is toxic to horses, has infested over eight million acres in California and continues to spread.
  • It is clear that invasive weeds cannot be controlled by scattered, piecemeal efforts. Only through cooperative, coordinated efforts can we hope to combat their spread, especially since weeds do not recognize political boundaries. There is a need for a shared responsibility in the prevention and control of invasive weeds, as well as a strategic approach that will improve the effectiveness of regional efforts. This need was addressed in the 1990 amendment to the Federal Noxious Weed Act of 1974, which requires Federal land management agencies to actively pursue the management of undesirable plant species in cooperation with State agencies.
  • In California, 15 State and Federal agencies have signed a Memorandum of Understanding (MOU) on the coordinated management of undesirable plants on Federal and State lands, as well as private lands that are adjacent to public lands. Representatives from these agencies have formed the California Interagency Noxious Weed Coordinating Committee, and have been meeting regularly in order to exchange information regarding noxious weed management issues. For more information on this effort, please contact one of the agency representatives listed above.
  • * Visit the California Noxious Weed Projects Database: a Project of the California Interagency Noxious Weed Coordinating Committee.
  • * CINWCC has a quarterly publication called Noxious Times. Reaching over 1000 people with each issue, the newsletter provides readers with current information on issues of interest to the weed management community. You can view back issues online at