Rhizopus Soft Rot on Grape Caused by Rhizopus stolonifer in Korea

Kwon, Jin Hyeuk; Shim, Chang Ki; Chae, Yun Seok; Park, Chang Seuk

Research in Plant Disease 2007;13(1):57-60.
Published online April 30, 2007.

Rhizopus stolonifer에 의한 포도 무름병

권진혁, 심창기, 채윤석, 박창석

Rhizopus Soft Rot on Grape Caused by Rhizopus stolonifer in Korea

Jin Hyeuk Kwon, Chang Ki Shim, Yun Seok Chae, Chang Seuk Park

Abstract

A rhizopus soft rot caused by Rhizopus stolonifer occurred sporadically on grape in orchard in Gyeongsangnam- do Agricultural Research and Extension Services and in Wholesale Market of Agricultural Products in Jinju city. The infected fruits were rapidly water-soaked, softened and eventually rotted, and the symptoms were initiated from wounds or cracks occurred at harvest time. Sporangiophores were 850~1,800 μm in length and 12~23 μm in width. Sporangia were globose or hemispheric and 80~190 μm in size. The color of sporangia was white and cottony at first and gradually to brownish black, bearing abundant spores when it matured. Columella were hemispheric and 70~95 μm in size. Sporangiospores were irregular round or oval, brownish-black streaked and 8~22 × 6~10 μm in size. The optimum temperature for mycelial growth of the fungus on PDA was 25oC. On the basis of mycological characteristics and pathogenicity to grape (Vitis vinifera), the causal fungus was identified as Rhizopus stolonifer (Ehrenberg ex. Fr.) Lind. This is the first report of Rhizopus soft rot by R. stolonifer on grape (V. vinifera) in Korea.

Key Words: Grape, Rhizopus soft rot, Rhizopus stolonifer, Vitis vinifera