First Report of Sclerotinia sclerotiorum Causing Sclerotinia Rot on Ixeridium dentatum in Korea

Myung Soo  Park1   Young Guk  Kim2   Sang Won  Lee2   Chun Geun  Park2   Yong Il  Kim2   Eun Song  Lee2   Jae Ki  Chang2   Tae Jin  An2,*   

1School of Biological Sciences and Institute of Microbiology, Seoul National University
2National Institute of Horticultural and Herbal Science

Abstract

Sclerotinia rot was observed on Ixeridium dentatum cultivated as a succeeding crop in a garlic field in Seosan-si, Korea during the growing season in 2016 and 2017. Symptoms progressed from the initial irregular, water-soaked spots on main stems to wilting and eventually to plant death. White, cottony mycelia and black, irregular sclerotia formed on the basal stem and on soil surfaces. The optimal temperature of hyphal growth and sclerotia germination were 20°C and 25°C, respectively. Sequence analysis of the internal transcribed spacer (ITS) regions revealed that the three strains isolated from Ixeridium dentatum are grouped with Sclerotinia sclerotiorum. Three strains were identified as Sclerotinia sclerotiorum based on morphological features, ITS sequence, and pathogenicity test. To the best of our knowledge, this work is the first report of Sclerotinia sclerotiorum causing sclerotinia rot on Ixeridium dentatum in Korea.

Acknowledgements

This research was supported by the national joint agricultural research Program (Project No. PJ01187802) of the Rural Development Administration, Republic of Korea.

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