Black Spot of Sweet Persimmon (Diospyros kaki) Caused by Alternaria alternata

Kwon, Jin Hyeuk; Ahn, Gwang Hwan; Park, Chang Seuk

Research in Plant Disease 2004;10(3):183-187.
Published online September 30, 2004.

Alternaria alternata에 의한 단감 검은점무늬병 발생

권진혁, 안광환, 박창석

Black Spot of Sweet Persimmon (Diospyros kaki) Caused by Alternaria alternata

Jin Hyeuk Kwon, Gwang Hwan Ahn, Chang Seuk Park

Abstract

Black spot disease on sweet persimmon (Diospyros kaki cv. Fuyu) was found from the farmer`s refregerated ware house located in Dong-eup, Changwon city, Gyeongnam province, Korea, 2002. The typical symptoms of the disease was appeared black spot on surface of fruits. Colonies of causal fungus were developed velvety and later turned olivaceous black to sooty black in color on PDA. Conidia were pale brown to golden brown in color and ovoid, obclavate to obpyriform, rarely ellipsoid in shape. and were 12~46 × 6~12 μm in size. Septa were 3~5 transvers, 1~2 longitudinal or oblique. Conidia were mostly beakless and generated chains by means of secondary conidiophores. Conidiophores were pale to mid brown in color and 42~95 × 3~5 μm in size. The optimum temperature for growth of the fungus was about 25~30℃. This is the first report on the black spot of sweet persimmon caused by Alternaria alternata (Fr.) Keissler in Korea.

Key Words: Alternaria alternata, Black spot, Swet persimmon