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You are here: Home / Microbes / Species Profiles / Sudden Oak Death
Species Profiles

Sudden Oak Death

Sudden Oak DeathScientific name: Phytophthora ramorum

Common names: Sudden oak death, ramorum blight, ramorum dieback

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Native To: Unknown; first discovered in the U.S. and Europe at approximately the same time (Scianna et al. 2003)

Date of U.S. Introduction: 1995 (Scianna et al. 2003)

Means of Introduction: Accidental

Impacts: Potential loss of hardwood forest and increased potential of forest fire; impact to nursery and landscaping businesses (Scianna et al. 2003)

Current U.S. Distribution:




  • Sudden Oak Death (or select Play button below)
    University of California Television (UCTV). (YouTube).

Selected Resources:

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Fact Sheet: Sudden Oak Death
Massachusetts Introduced Pests Outreach Project.

Sudden Oak Death Syndrome
Nature Conservancy. Don't Move Firewood.

Phytosanitary Alert System - Phytophthora ramorum: A newly isolated pathogen responsible for severe oak mortality on the west coast of the U.S.
North American Plant Protection Organization.

Invasive Species Compendium - Phytophthora ramorum
CAB International.

Phytophthora ramorum
European and Mediterranean Plant Protection Organization.

Invasive Alien Species Fact Sheet: Phytophthora ramorum (PDF | 175 KB)
North European and Baltic Network on Invasive Alien Species.

Global Invasive Species Database - Phytophthora ramorum (fungus)
World Conservation Union. Invasive Species Specialist Group.


Sudden Oak Death
USDA. APHIS. Hungry Pests.

Phytophthora ramorum / Sudden Oak Death
USDA. APHIS. Plant Protection and Quarantine.

Sudden Oak Death National Detection Survey
USDA. FS. National Forest Health Monitoring.

Sudden Oak Death - Plant Materials Technical Note No. MT-44 (Feb 2003; PDF | 72 KB)
USDA. NRCS. Plant Materials Program.

Sudden Oak Death
DOI. NPS. Redwood National and State Parks.

Phytophthora ramorum
United Kingdom Department for Environment, Food, and Rural Affairs. Food and Environment Research Agency.

Phytophthora ramorum
United Kingdom Forestry Commission.


Sudden Oak Death (SOD)
California Department of Parks and Recreation.

Ramorum Blight (Sudden Oak Death) (PDF | 240 KB)
Connecticut Agricultural Experiment Station.

Forest Health Notes: Keep an Eye Out for Sudden Oak Death (Jan 2011; PDF | 626 KB)
Mississippi Forestry Commission. Forest Health Program.

Sudden Oak Death (SOD), Ramorum Leaf Blight, Ramorum Dieback- a nursery plant disease that threatens oaks
North Carolina Department of Agriculture and Consumer Services. Plant Industry.

Sudden Oak Death
Washington Department of Agriculture.


Sudden Oak Death (PDF | 311 KB)
University of Arkansas. Cooperative Extension Service.

Sudden Oak Death - Pests in Gardens and Landscapes (Sep 2010)
University of California. Statewide Integrated Pest Management Program.

Sudden Oak Death
University of California - Berkeley. Forest Pathology and Mycology Lab.

How to recognize symptoms of diseases caused by Phytophthora ramorum causal agent of Sudden Oak Death (PDF | 504 KB)
University of California - Berkeley. Cooperative Extension; USDA. Forest Service.

Sudden Oak Death
University of California - Riverside. Center for Invasive Species Research.

Introduced Species Summary Project - Sudden Oak Death
Columbia University. Center for Environmental Research and Conservation.

Sudden Oak Death and Ramorum Blight
University of Florida. Institute of Food and Agricultural Sciences.

Sudden Oak Death
Louisiana State University. Extension Disaster Education Network.


Sudden Oak Death
California Oak Mortality Task Force.
Seel also: Press Releases and COMTF Newsletter

Pest Alert: Sudden Oak Death
North Central Region Pest Management Center.


Scianna, J.D, M.K. Knudson,and J.A. Dickerson. 2003. Sudden Oak Death (SOD) (PDF | 72 KB). USDA. Natural Resourcs Conservation Services. Plant Materials Technical Note No. MT-44.

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Last Modified: Mar 20, 2015
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