Forest Service Sudden Oak Death Pest Alerts
Eastern U.S.
Western U.S.
Other Disorders of Oak
Oak Wilt
Oak Decline
Red Oak Borer
Links to More Information
California Oak Mortality Task Force
University of California at Berkeley
University of California at Davis
Oregon Dept. of Ag. Pest Alert
Oak and Tanoak Mortality
Contact Information
Regional Contacts


  Sudden Oak Death is a recently recognized disease that is killing oaks and other plant species in the western U.S. First noticed in 1995, the disease has been confirmed in the coastal areas north and south of San Francisco, and in a relatively remote location in southwestern Oregon. The pathogen responsible for the disease, a fungus-like organism called Phytophthora ramorum, is also found in Germany and Denmark, where it is causing a recently identified disease on Rhododendron and Viburnum.

Although in the U.S. the disease has been found only in California and Oregon, it is of great concern to land managers in the Eastern U.S. as well, because at least two eastern oak species, pin oak (Quercus palustris) and northern red oak (Quercus rubra), are highly susceptible to the disease when inoculated with the pathogen. Forest land managers nationwide should be aware of the symptoms of sudden oak death, and should contact a pest management specialist if they suspect that the disease is present in a new location.