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This document summarizes the origins of the World Phytophthora Genetic Resource Collection (WPC). The WPC was founded in 1966 in Denver by Professors D.C. Erwin and G.A. Zentmyer of the University of California, Riverside, who collected isolates of Phytophthora from alfalfa and cacao respectively, forming the basis of the collection. The WPC is an important collection of Phytophthora isolates that has its origins in the research work of Erwin and Zentmyer in the 1960s.










































