What is Sudden Oak Death?

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.

Areas of Interest

P. ramorum in Wildlands The information in this section is geared toward land management, forestry and arboriculture professionals, including Best Management Practices.
P. ramorum in Nurseries This section addresses P. ramorum issues critical to nurseries, independent growers, and related plant-care/plant propagation industries, including Nursery Diagnostic Guides.
P. ramorum
in the Urban Interface
Look here for resources that address common homeowner questions, including diagnosing Sudden Oak Death and finding an arborist to work with.


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



Latest SOD Blitz results show continued high infection rates in coastal CA mountains. Read more…

WA water samples suggest P. ramorum may be gone from the Dungeness River watershed. Read more…

2016 Phytophthora ramorum Request for Pre-Proposals (RFP) due January 7, 2016. Read more…

Check out the just-released Fall 2015 SOD Management and Blitz Results Workshops

Resources on P. tentaculata, recently found in native plant nurseries and restoration sites.

New THANQs – FAQ Resource for Tree Health Questions

Read 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.

Calendar of Events


11/3 – Sudden Oak Death and Oak Drought Management Workshop; Sebastopol

11/4 – Sudden Oak Death and Oak Drought Management Workshop; UC Berkeley

11/4 – 11/5 – Annual Meeting of the California Forest Pest Council; Wildland Fire Training & Conference Center, McClellan CA

See the entire events calendar.