Student Pathological Organization for Research and Education (MSU Plant Pathology Student Organization)
http://www.spore.msu.edu
American Phytopathological Society
http://www.apsnet.org
The International Society for Plant Pathology
International Society for Molecular Plant-Microbe Interactions
Canadian Phytopathological Society
British Society for Plant Pathology
Australasian Plant Pathology Society
The Plant Pathology Internet Guide Book