Journal of Phytopathology (2015) 163, 670-674

Jin-Hyeuk Kwon, Dong-Wan Kang, Sang-Dae Lee and Jinwoo Kim (2015)
Outbreak of Rhizopus rot caused by Rhizopus oryzae on seedlings of grafted cucumber on pumpkin rootstock in South Korea
Journal of Phytopathology 163 (7-8), 670-674
Abstract: In 2013, an outbreak of Rhizopus rot caused by Rhizopus oryzae occurred in cucumber grafted onto pumpkin rootstock sampled from seedling farms in Changnyeong, South Korea. A water-soaked appearance of the affected tissue was the first symptom of this soft fungal rot in the seedling stems of grafted cucumber. Lesions at the graft sites softened and rapidly, rotted, and turned brown or dark brown. Measurements and taxonomic characteristics were most similar to R. oryzae. DNA sequencing and phylogenetic analysis of the internal transcribed spacer rRNA gene region confirmed that the isolates were indeed R. oryzae. Koch's postulates were supported by pathogenicity tests conducted on healthy plants. Based on mycological characteristics, pathogenicity test, and molecular analysis, the causal fungus was identified as R. oryzae Went and Prinsen Geerligs. To our knowledge, this is the first report of Rhizopus rot caused by R. oryzae in seedlings of grafted cucumber on pumpkin rootstock in South Korea.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Jinwoo Kim

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Rhizopus arrhizus	Cucumber (Cucumis sativus)	Korea-South