Other Phytophthora species in California’s Native Habitats

Photo by Janell Hillman, Santa Clara Valley Water District

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 to additional resources

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

Guidelines and Best Practices

Nursery Accreditation Pilot Program

Phytophthoras in Native Habitats Work Group

Phytophthora Testing Techniques and Protocols

Calendar of Events

Are native plant sales byways for pathogens? Are there practical approaches for handling buy-ins? Virtual seminar, November 15, 2021 – Recording & Follow up Q&A

Recordings of the COMTF Virtual Annual Meeting, held September 21-23, 2021

The 2020 virtual Phytophthora in Native Habitats Work Group meeting recording is HERE.

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

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

The Phytophthoras in Native Habitats Work Group

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

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