Phytophthora ramorum/Sudden Oak Death |
|
 |
|
Background
Since the early 1990s, oaks and tanoaks have been dying in the coastal counties of California. Since then, other types of plants have been found to be infected or associated with this disease, referred to as Sudden Oak Death (SOD), ramorum leaf blight or ramorum dieback. Phytophthora ramorum is the pathogen that causes these diseases. Sudden Oak Death was first reported in 1995 in Mill Valley (Marin County) on tanoak. Since that time, the pathogen has been confirmed on various native hosts in fourteen coastal California counties (Marin, Santa Cruz, Sonoma, Napa, San Mateo, Monterey, Santa Clara, Mendocino, Solano, Alameda, Contra Costa, Humboldt, Lake, and San Francisco), and in Curry County, Oregon. Through ongoing surveys, APHIS-PPQ continues to define the extent of the pathogen’s distribution in the US and limit its artificial spread beyond infected areas through quarantine and a public education program.
 |
|
|
|
News and Information
- Phytophthora ramorum: Stopping the Spread (brochure)
- National Pest Alert (PDF; 254 Kb)
- Frequently Asked Questions
- On-Line Resources
Maps
- Quarantined and Regulated Counties (PDF; 428 Kb) - This map depicts the areas of the United States currently regulated for Phytophthora ramorum. The three states regulated are the western-most states of the continental United States: Washington, Oregon, and California. As there is forest infestation, we have quarantined the 14 orange or more darkly shaded counties near the coast of California as well as a part of Curry County in the southwest corner of Oregon and have restrictions on the movement of nursery stock, forest products and soil. Due to detections limited to nurseries, for the remainder of California, Oregon and Washington, the yellowish or lighter areas, we regulate the movement of nursery stock only.
Plans
Regulation
Response
Contact:
Jonathan M. Jones
National Phytophthora ramorum Program Manager
Telephone: 301-734-5038
E-mail: Jonathan.M.Jones@aphis.usda.gov