EPPO Global Database

Phytophthora ramorum(PHYTRA)

Distribution details in United States of America

Current pest situation evaluated by EPPO on the basis of information dated 2013: Present, restricted distribution
From CABI Disease map 978 (2013): Present, restricted distribution
In USA, Phytophthora ramorum occurs in coastal evergreen forests of California and Oregon where it causes sudden oak death. It was also reported from various states in nurseries causing leaf necrosis and twig dieback on various ornamental species; trade of nursery plants being an obvious means of spreading the pathogen. In USA, P. ramorum is subject to containment and eradication measures.

EPPO Reporting Service (2001/002) : the agent of sudden oak death in California is an Phytophthora similar to P. ramorum isolated on Rhododendron in The Netherlands. Many experts believe it to be the same fungus, but there are some differences whose significance remains to be determined.

EPPO Reporting Service (2005/160) : general update on situation.

EPPO Reporting Service (2011/003) : detected on a single Abies magnifica tree (in a Christmas tree plantation in California).

EPPO Reporting Service (2014/015) : detected on Cinnamomum camphora (urban trees in Mill Valley, Marin county - nursery trees in Sacramento county).
* Chastagner GA, Riley KL (2010) First report of Phytophthora ramorum infecting California red fir in California. Plant Disease 94(9), p 1170.

* Hansen, E.M.; Reeser, P.W.; Sutton, W.; Winton, L.M.; Osterbauer, N. (2003) First report of A1 mating type of Phytophthora ramorum in North America. Plant Disease, 87(10), p 1267

* NAPPO News Story of 2002-01-10: associated with redwoods

* NAPPO News Story of 2002-03-05: emergency regulations applied to infested areas in California and Oregon

* NAPPO News Story of 2002-04-25

USDA-APHIS website
- Plant disease caused by Phytophthora ramorum. A national strategic plant for USDA (2005-09-15). http://www.aphis.usda.gov/ppq/ispm/pramorum/pdf_files/usdaprstratplan.pdf
- Pest detection and management programs – Phytophthora ramorum. Program update 2005-11-16. http://www.aphis.usda.gov/ppq/ispm/pramorum/updates/update11-15-05.pdf
California oak mortality task force website.http://nature.berkeley.edu/comtf/html/about_p__ramorum.html

* Rooney-Latham S, Honeycutt E, Ochoa J, Grünwald NJ, Blomquist CL (2013) First report of camphor tree (Cinnamomum camphora) as a host of Phytophthora ramorum. Plant Disease 97(10), 1377-1378.
------- On Cinnamomum camphora.
Situation in neighbouring countries
Country State Status
Canada British Columbia Present, few occurrences view...
Canada Present, few occurrences view...