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.

Webpages for each forest Phytophthora species (see left sidebar) include:

  • The pathogen: morphological descriptions, genetics, colony growth characteristics.
  • The disease: hosts, symptoms, and forest impacts
  • Management and educational materials
  • References

Thirteen of the most damaging species of forest Phytophthoras are included on the website as of January 2014.  A few species will be added each year.

A new online scientific journal, Forest Phytophthoras, has been launched to provide a permanent site for publication of peer-reviewed articles appearing on the website.

To contribute articles, make suggestions, or add calendar items please contact us.

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

Key to Species - an easy-to-use synoptic key that allows the user to select observable characters of an unidentified Phytophthora to learn which species match those characteristics.

Disease Finder - Find Phytophthora species by host, geographic area, habitat, or disease symptoms.


Illustrated Glossary - with explanatory photos or drawings

Photo Gallery - compare morphological characters among species, view disease symptoms, etc., with easy to use filters.


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

Access IUFRO and SOD Symposium proceedings.

Learn about forest Phytophthora expertise around the world.

View useful Phytophthora web resources.