First record of Pythium grandisporangium in Japan

Pythium grandisporangium was isolated from roots of common reed and seawater in a saline marsh in Osaka Bay for the first time in Japan. Morphological features and rDNA ITS sequences were described on isolates of the species. The isolates grew on corn meal agar containing 0–9% sea salts, with 1–3% being the ideal range for growth. The isolates produced no disease on roots of common reed, but they colonized root surfaces in in vitro inoculation studies.