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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 Werres, de Cock & Man in't Veld (Kliejunas 2010)

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

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Selected Resources

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

Impact: 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:




Selected Resources:

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

Gallery of Pests - Sudden Oak Death Syndrome
Nature Conservancy. Don't Move Firewood.

Phytosanitary Alert System - Phytophthora ramorum
North American Plant Protection Organization.

Invasive Species Compendium - Phytophthora ramorum
CAB International.

Plantwise Technical Factsheet - Sudden Oak Death (SOD) (Phytophthora ramorum)
CABI. Plantwise Knowledge Bank.

EPPO Global Database - Phytophthora ramorum
European and Mediterranean Plant Protection Organization.

NOBANIS: Invasive Alien Species Fact Sheet - Phytophthora ramorum (2013; PDF | 175 KB)
European Network on Invasive Alien Species.
See also: NOBANIS Fact Sheets for invasive alien species of the European region, covering both animals and plants, as well as microorganisms

Global Invasive Species Database - Phytophthora ramorum (fungus)
IUCN. Species Survival Commission. Invasive Species Specialist Group.

Invaders Factsheet: Sudden Oak Death
Ontario's Invading Species Awareness Program (Canada).

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.

Federal Government

Hungry Pests: The Threat - Sudden Oak Death
USDA. Animal and Plant Health Inspection Service.

Plant Pests and Diseases Program: Plant Disease - Phytophthora ramorum
USDA. APHIS. Plant Protection and Quarantine.

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

Plant Materials Technical Note - Sudden Oak Death (Feb 2003; PDF | 72 KB)
USDA. NRCS. Plant Materials Program.
See also: Invasive Species Technical Notes for more species

Redwood National and State Parks - Sudden Oak Death
DOI. National Park Service.

International Government

Phytophthora ramorum: A Practical Guide for Established Parks and Gardens, Amenity Landscape and Woodland Areas (2008; PDF | 724 KB)
Department for Environment Food and Rural Affairs (United Kingdom).
See also: Pest and Disease Factsheets for more fact sheets.

Top Tree Diseases - Phytophthora ramorum
United Kingdom Forestry Commission.

State Government

Ramorum Blight (Sudden Oak Death) (PDF | 240 KB)
Connecticut Agricultural Experiment Station.
See also: Publications - All CAES Factsheets for more resources

Regulatory & Scientific Information: Sudden Oak Death
Indiana Department of Natural Resources. Entomology and Plant Pathology.

Plant Diseases - Sudden Oak Death
Minnesota Department of Agriculture.

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.
See also: Common Disease Problems for more factsheets

Pest Notes: Sudden Oak Death
University of California. Statewide Integrated Pest Management Program.
See also: Pest Notes are peer-reviewed scientific publications about specific pests or pest management topics, directed at California's home and landscape audiences.

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

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.

EDIS - Sudden Oak Death and Ramorum Blight
University of Florida. Institute of Food and Agricultural Sciences Extension.
Electronic Data Information Source Publication #PP197

Forecasting Invasion Risks: Factsheets - Ramorum Blight (Feb 2010; PDF | 1.4 MB)
Michigan State University. Integrated Pest Management Program.

See also: Forecasting Invasion Risks for more factsheets


Sudden Oak Death
California Oak Mortality Task Force.
See also: COMTF Newsletter

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


Kliejunas, J.T. 2010. Sudden oak death and Phytophthora ramorum: A summary of the literature (PDF | 3.50 MB) (PSW-GTR-234). U.S. Forest Service, Pacific Southwest Research Station.

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

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Last Modified: Sep 03, 2018
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