SODMAP: includes P. ramorum reports confirmed by an official laboratory, including negative findings, with the intention of sharing known distribution information gathered by public agencies and research groups across the country.

OakmapperMapThumbWebOakMapper: GIS tool that allows the user to learn about P. ramorum distribution in California.



Risk Maps [Additional risk maps can be found on the Modeling the Distribution and Spread of P. ramorum page]

2009 national risk map for sudden oak death (Phytophthora ramorum). State boundaries are included for reference.


  • National SOD Risk Map Koch, F.H.; Smith, W.D. 2012. A revised sudden oak death risk map to facilitate national surveys. Chapter 7 in Potter, K.M.; Conkling, B.L. (eds.) Forest Health Monitoring 2009 National Technical Report. Gen. Tech. Rep. SRS-167. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station, pp. 109-136.




US East Coast Hazard Map

Establishment of Phytophthora ramorum in the Appalachian Mountains would pose the greatest threat to vegetation in the Eastern U.S., according to a Hazard map developed by modelers out of Chris Gilligan’s lab at Cambridge University.

More about this and other epidemiological modeling work from the Gilligan group may be found at by emailing Dr Matt Castle (


USDA Forest Service, State and Private Forestry-Pacific Southwest Region Aerial Detection Survey: View the latest tree mortality maps generated by aerial flyovers.

2007-2008 P. ramorum Quarantine Boundary, Oregon


Southern Humboldt Tanoak Mortality 2007

Phytophthora ramorum Plant Host CommunitiesPoint Reyes National Seashore June 2005

2004 Targeted Ground Survey R. Meentemeyer and W. Mark

North Coast survey 2004

Northern California survey 2004

Sierra Nevada survey 2004

South Coast survey 2004

Southern California survey 2004

Maps courtesy of R. Meentemeyer and W. Mark

2003 Early Detection Ground Survey Sites