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.


2014 SOD Blitz Results

Phytophthora ramorum found in Redwood National Park and six new north coast waterways. Read more…

New Zealand implements emergency P. ramorum regulations. Read more…

Phytophthora tentaculata found infesting native plant nurseries and restoration sites in California. Read more…

Urban Forest Insect & Disease Workshop for South Bay arborists coming September 30. Read more…

Read the latest newsletter.

The Art of Saving Oaks – the fourth exhibition of art related to oak woodlands, entirely online from February 2014-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

9/30 – Urban Forest Insect and Disease Workshop for South Bay Arborists; Woodside

10/5 – 10/10 – IUFRO 2014 World Congress “Sustaining Forests, Sustaining People, The Role of Research;” Salt Lake City, Utah

10/22 – SOD Treatment Workshop; Berkeley

11/3 – 11/6 – 7th California Oak Symposium; Visalia Convention Center, Visalia

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.