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  • Home - Sudden Oak Death
    Welcome to the landing page of the California Oak Mortality Task Force Our focus is on the tree disease Sudden Oak Death, caused by the fungus-like plant pathogen Phytophthora ramorum There are many other causes of mortality in California oaks, including Goldspotted Oak Borer, Mediterranean Oak Borer, Phytophthora root rot, and multiple issues related to […]
  • Hosts and Symptoms - Sudden Oak Death
    Diagnosis Accurate disease diagnosis can be difficult because the symptoms caused by Phytophthora ramorum are very similar to those caused by other fungi, insects, or adverse environmental conditions The only way to confirm a P ramorum or Sudden Oak Death infection is to take a sample and analyze the affected plant tissue in a laboratory
  • Sampling - Sudden Oak Death
    Sudden oak death and associated diseases caused by Phytophthora ramorum: The guide is for field and laboratory diagnostic use In addition to pictures and descriptions of symptoms on numerous hosts, it includes culture and PCR isolation instructions as well as culture description and storage tips Diagnosis and Monitoring of Sudden Oak Death
  • About California Oak Mortality Task Force - Sudden Oak Death
    About California Oak Mortality Task Force The California Oak Mortality Task Force (COMTF) is a non-profit group working to manage Sudden Oak Death in California
  • Diagnosis and Management - Sudden Oak Death
    In this section, you’ll find links to descriptions and photos of Phytophthora ramorum symptoms, a list of currently known host plants, and how to diagnose, treat, and manage the disease Diagnosis and Management Hosts and Symptoms: Information on how Sudden Oak Death affects host plants and how to get an accurate diagnosis Best Management Practices: Customized BMPs for different […]
  • Maps - Sudden Oak Death
    Distribution of Phytophthora ramorum in wildlands in California and Southern Oregon, 2021 Credit: Garbelotto, CALINVASIVES Map of confirmed counties with Sudden Oak Death caused by Phytophthora ramorum in Northern California Download PPQ P ramorum Quarantine Map (April 2022) Links to updated (late 2019) county maps displaying known, confirmed trees infected by P ramorum, based on SODMap (UC
  • Best Management Practices - Sudden Oak Death
    The California Oak Mortality Task Force has compiled Best Management Practices (BMPs) for a number of wildland and urban-interface area activities and user groups Also see Nursery BMPs Sudden Oak Death Guidelines for Landscapers and Gardeners (Last update: July 2021) A Christmas Tree Grower’s Guide to Sudden Oak Death (Last update: July 2021) Sudden Oak […]
  • Sanitation and Reducing Spread - Sudden Oak Death
    Should a diseased oak tree be removed? A tree with P ramorum needs to be viewed and treated differently than a tree without the disease, but the disease alone is not justification for removing a tree An important consideration with respect to any tree is whether or not it presents a hazard to life or property All trees present some hazard, depending on the tree’s structural integrity and
  • Treatment and Management - Sudden Oak Death
    Treatments While there is no cure for Sudden Oak Death or other P ramorum- associated diseases, there are preventive measures that may protect plants The publication “ Protecting Trees from Sudden Oak Death Before Infection ” provides helpful treatment information for areas not currently infested but at risk
  • Newsletter - Sudden Oak Death
    Newsletter The latest newsletter includes what’s happening with monitoring, funding, nurseries, education, the calendar of events, and more Looking for something older? View the newsletter archive Receive the newsletter directly in your inbox by signing up for our mailing list Current California Oak Mortality Task Force Newsletter: August 2026 (Printable COMTF Report August 2026) The





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