Welcome to Forest Phytophthoras of the World

Plant pathogens in the genus Phytophthora threaten the biodiversity and sustainability of forest ecosystems worldwide. The aim of the website is to provide science-based information to aid in the understanding and management of the world’s forest Phytophthora species. Twenty of the most damaging species of forest Phytophthoras are profiled as of January 2021. Click on any Phytophthora species (see left sidebar) to reveal information about the pathogen and the forest disease(s) it causes, access educational and disease management materials, and view scientific  references.

Dr. Jennifer Parke, Editor-in-Chief
Joyce Eberhart, Managing Editor
Oregon State University (USA)

Phytophthora Basics
Get basic information on Phytophthora species and the diseases they cause

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Photo Gallery

See morphological characters of different Phytophthora species and view disease symptoms

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Disease Finder

Find Phytophthora diseases by host, geographic area, habitat, Phytophthora species or disease symptoms


 Conference Proceedings
Access IUFRO and SOD Symposium proceedings

Forest Phytophthoras
Link to the scientific journal for publications of peer-reviewed articles

Web Resources

Check out other useful Phytophthora web resources

Contact us with calendar and news items, or to join our mailing list.

Learn about forest Phytophthora expertise around the world.