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.


SOD continues to spread in Humboldt County. Read more…

Drier weather in 2013-2014 leads to fewer larch infections in the UK. Read more…

Pilot project to test Systems Approach to Nursery Certification (SANC) under development. Read more…

New THANQs – FAQ Resource for Tree Health Questions

Read the latest newsletter.

October is National Arts Month! The Art of Saving Oaks – the fourth exhibition of art related to oak woodlands – is online NOW through February 2015.

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 – 11/6 – 7th California Oak Symposium; Visalia Convention Center, Visalia

11/7 – SOD and the Mattole Watershed Community Meeting; Honeydew

11/10 – 11/14 – Seventh meeting of the IUFRO Working Party 7.02.09 “Phytophthora in Forests and Natural Ecosystems;” Esquel, Argentina

See the entire events calendar.