Sudden Oak Death (Phytophthora ramorum (Pr) also known as Sudden Oak Death, ramorum leaf blight and ramorum dieback |
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In general, P. ramorum, or Sudden Oak Death, has been observed in three main forest types in California: Mixed Evergreen-Bay-Arbutus; these are fairly dry open forests with a grass and dense shrub understory.
Tanoak-Douglas fir; this is a wetter forest, frequently with Vaccinium being the major understory species, and
Coast Redwood; these sites are usually more open, often with tanoak as the major understory.
Oregon P. ramorum sites are ecologically quite similar to California tanoak-Douglas fir sites. Overall, it appears that the fungus demonstrates a preference for cool temperatures with relatively high moisture. Growth of P. Ramorum in inoculated seedlings was substantially faster in the fall than in summer.
In the News |
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USDA Takes Action in Three States to Halt Spread of Plant Fungus
Veneman Announces Funding for Oak Disease Containment
USDA Announces Oak Disease Detection Program for California Nurseries
Recent Initiatives |
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Regulations and Regulatory Updates
Amended Order Restricting Movement of Nursery Stock from Nurseries
Phytophthora ramorum: Stopping the Spread
Stakeholder Announcement: Federal, State Agriculture Officials Confirm the Sudden Oak Death Pathogen in Southern California Nurseries
Additional Information |
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Phytophthora ramorum Emergency and Domestic Programs
Last Modified: October 4, 2007