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.



Registration for The Sixth Sudden Oak Death Science Symposium now open!

Press Release: 2016 rains make the 10th annual Sudden Oak Death survey one of most important yet

2016 Farm Bill awards $1.2 million to P. ramorum programs in 17 states. Read more…

The SANC initiative to certify clean nursery stock in progress at 8 pilot nurseries around the country. Read more…

The Karuk tribe joins stream monitoring efforts in Northern California. Read more…

Sweet chestnut trees in the UK are infected with P. ramorum spores over longer distances than originally thought. Read more…

Read the latest newsletter.

Resources on P. tentaculata, recently found in native plant nurseries and restoration sites, can be found on the new CalPhytos.org web page.

New THANQs – FAQ Resource for Tree Health Questions

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

4/9 – East Bay (Orinda) SOD Blitz Training; Orinda

4/9 – East Bay (Berkeley) SOD Blitz Training; UC Berkeley

4/17 – 4/23 – Burlingame Hills SOD Blitz; Burlingame

6/21 – 6/23/16 Sudden Oak Death Science Symposium 6; San Francisco

See the entire events calendar.