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http://dx.doi.org/10.5423/RPD.2007.13.1.057

Rhizopus Soft Rot on Grape Caused by Rhizopus stolonifer in Korea  

Kwon, Jin-Hyeuk (Gyeongsangnam-do Agricultural Research and Extension Services)
Shim, Chang-Ki (Organic Farming Technology Division, National Institute of Agricultural Science and Technology, RDA)
Chae, Yun-Seok (Department of Horticultural Science, Jinju National University)
Park, Chang-Seuk (College of Agriculture and Life Sciences, Gyeongsang National University)
Publication Information
Research in Plant Disease / v.13, no.1, 2007 , pp. 57-60 More about this Journal
Abstract
A rhizopus soft rot caused by Rhizopus stolonifer occurred sporadically on grape in orchard in Gyeongsang-nam-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 $850{\sim}1,800{\mu}m$ in length and $12{\sim}23{\mu}m$ in width. Sporangia were globose or hemispheric and $80{\sim}190{\mu}m$ 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 $70{\sim}95{\mu}m$ in size. Sporangiospores were irregular round or oval, brownish-black streaked and $8{\sim}22{\times}6{\sim}10{\mu}m$ in size. The optimum temperature for mycelial growth of the fungus on PDA was 25$^{\circ}C$. 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.
Keywords
Grape; Rhizopus soft rot; Rhizopus stolonifer; Vitis vinifera;
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