Research in Plant Disease 2008;14(1):57-60.
Published online April 30, 2008.
Rhizopus stolonifer에 의한 사과 무름병 발생
권진혁, 지형진
Occurrence of Rhizopus Soft Rot on Apple Fruit Caused by Rhizopus stolonifer in Korea
Jin Hyeuk Kwon, Hyeong Jin Jee
A rhizopus soft rot caused by Rhizopus stolonifer occurred sporadically on apple fruits (Malus pumila var. dulcissima Koidz.) at a wholesale market of agricultural products in Jinju, Korea in 2006 and 2007. Infected fruits were rapidly water-soaked, softened and rotted. The symptoms were initiated mainly from wounds or cracks occurred at harvest time. Sporangiophores were 950~1,900 μm in length and 12~22 μm in width. Sporangia were globose or hemispheric and 82~185 μm in size. The color of sporangia was white and cottony at first and gradually turned to brownish black, bearing abundant spores when matured. Columella were hemispheric and 70~85 μm in size. Sporangiospores were irregular round or oval, brownish-black streaked and 8~18×7~8 μm in size. Optimum temperature for mycelial growth of the fungus on PDA was 25oC. On the basis of mycological characteristics and pathogenicity to apple the causal fungus was identified as Rhizopus stolonifer (Ehrenb.) Vuill. This is the first report of Rhizopus soft rot by R. stolonifer on Fuji apple in Korea.
Key Words: Apple, Malus pumila, Rhizopus soft rot, Rhizopus stolonifer

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