Other Phytophthora species in California’s Native Habitats

Several first-in-the-USA detections and newly identified species of Phytophthora in both native plant nurseries and restoration areas have occurred in recent years. Many of these Phytophthora species appear to have wide host ranges, capable of causing disease on plants across many families and in many different habitats. The Phytophthoras in Native Habitats Work Group formed to determine steps needed to protect wildlands and assist the restoration industry. The Work Group is now part of the California Oak Mortality Task Force and serves as an “Other Phytophthoras” committee for that group.

Quick Links General Nursery Accreditation Info Accreditation to Improve Restoration (AIR) website Guidelines and Best Management Practices Sampling and Diagnostic Guide for Soil-borne Phytophthora species on California Native Plants Part 1. Selecting Plants to Sample Bibliography for Phytophthora species in restoration areas, nurseries and wildlands Phytophthoras in Native Habitats Work Group Phytophthora Testing Techniques and Protocols

Calendar of Events 2024 COMTF and CalPhytos Virtual Annual Meetings:   Day 1 (October 29, 2024): 2024 Annual meeting of the California Oak Mortality Task Force; Focus on the status of sudden oak death/Phytophthora ramorum in California and Oregon wildlands – Recording and  Agenda Day 2 (October 30, 2024): CalPhytos meeting – “Threats to California Native Plants”; Focus on risks to plant health from viruses, excessive heat, and other concerns – Recording and Agenda Links to past COMTF and CalPhytos Virtual Annual Meetings: COMTF 2023 meeting recording CalPhtyos 2023 meeting recording  Nov 8, 2022 recording Nov 9, 2022 recording Nov 10, 2022 recording  View more details on upcoming events in the latest newsletter… News Are you subscribed to our newsletter? All the most important updates will be emailed directly to you! Sign up for our mailing list

More information on Phytophthora detections in California native plant nurseries and restoration areas can be found in the resources below:

• Background document (February 2017)
• Frequently Asked Questions about Phytophthoras (February 2017)
• Briefing paper (May 2015)

For more information on Phytophthora species that affect trees, visit the Forest Phytophthoras website.

The Phytophthoras in Native Habitats Work Group

• Mission Statement (draft as of November 2015)
• Accomplishment Report 2019-2020
• Accomplishment Report, 2018
• Accomplishment Report, 2017
• Working Group Organizational Chart (draft as of January 2016)

Contact us for more details on how you can be involved with the Work Group.

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