Sudden Oak Death is a tree disease caused by the plant pathogen Phytophthora ramorum. The disease kills some oak species and has had devastating effects on forests in California and Oregon. Read more about Sudden Oak Death.

Additional habitats in California are also at risk. Read more about other Phytophthora species found in native habitats, native plant nurseries, and restoration sites here.


The US Forest Service, Pacific Southwest Region, State and Private Forestry, Forest Health Protection program has issued its 2018-2019 Phytophthora ramorum Request for Pre-Proposals. Proposals should focus on management activities that could help limit the impact of sudden oak death (SOD) in California and/or southwest Oregon, improve understanding of pathogen spread, and promote the exchange of relevant information. The submission deadline is 4:00 pm on Jan. 5, 2018. For questions, contact Phil Cannon at or (707) 562-8913.

Potential new P. ramorum hosts identified, including threatened and endangered species. Read more…

SOD Blitz finds all-time highest infection rates after last winter’s heavy rains. Read more…

Nursery finds diminishing in WA but a new find in British Columbia during 2017 Canadian survey. Read more…

Read the latest newsletter.

Calendar of Events

October and November SOD Blitz Workshops Bay Area, CA

11/15 – 11/16 – 66th Annual Meeting of the California Forest Pest Council, “Responding to Large-Scale Tree Mortality in Urban and Rural Communities” Davis, CA

View more details on upcoming events in the latest newsletter…


Help stop the spread of forest pests – including Sudden Oak Death – on firewood! Check out the website of the California Firewood Task Force.

The California Oak Mortality Task Force is a task force under the California Forest Pest Council.