Fruit Soft Rot of Sweet Persimmon Caused by Mucor piriformis in Korea

摘要

A fruit soft rot caused by Mucor piriformis occurred on sweet persimmon storages in Jinju, Changwon and Ginihae, Gyeongnam province, Korea, 2003. The disease infection usually started from wounding after cracking of fruits. At first, the lesions started with water soaked and rapidly softened and diseased lesion gradually expanded. Colonies on potato dextrose agar at 20 deg C were whitish to olivaceous-buff. Sporangia were globose, black and 96 approx 153 mu m in size. Sporangiophores were 26 approx 42 mu m in width. Sporangiospores were ellipsoid and 5.8 approx 10.6 x 4.3 approx 7.6 mu m in size. Columella was obovoid, cylindrical-ellipsoidal, pyriform, subglobo.se and 80 approx 125mu m in size. Optimal temperature for mycelial growth was 20 deg C on PDA. The causal organism was identified as M. piriformis. This is the first report of fruit soft rot on sweet persimmon caused by M. piriformis in Korea.