American Phytopathological Society http://www.apsnet.org/
International organization that promotes the study and management of plant diseases through journal and book publications, meetings, and electronic resources for students, teachers and researchers.
International Society of Plant Pathology http://www.isppweb.org/
Worldwide organization supporting the development and dissemination of knowledge about plant diseases and management. Includes links to national, regional and international associated societies.
European Foundation for Plant Pathology http://www.efpp.net/
Promotes scientific and technical cooperation in plant health in Europe and facilitates the exchange of information between pathologists who are members of national or regional societies.
New Zealand Plant Protection Society http://www.nzpps.org
Professional society researching and publishing biology, ecology and control of weeds, pests, pathogens and beneficial organisms in agriculture, horticulture, forestry and natural ecosystems.