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Pythium aphanidermatum Oospore Germination as Affected by Time, Temperature, and pH. Peter B. Adams, Research Plant Pathologist, Plant Science Research Division, ARS, USDA, Beltsville, Maryland 20705; Phytopathology 61:1149-1150. DOI: 10.1094/Phyto-61-1149.

Germination of Pythium aphanidermatum oospores, obtained from a synthetic liquid medium, was studied in autoclaved soil. Oospores began to germinate within 2 hr. After a 10- to 12-hr incubation period, hyphal growth obscured the oospores, making observation of germination difficult. The optimum temperature and pH for germination was 30 C and 7.5, respectively.