The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Occurrence of Leaf Blight on Cosmos Caused by Alternaria cosmosa in Korea

  • Deng, Jian Xin (Department of Plant Protection, College of Agriculture, Yangtze University) ;
  • Lee, Ji Hye (Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Paul, Narayan Chandra (Division of Applied Bioscience & Biotechnology, College of Agriculture & Life Sciences, Chonnam National University) ;
  • Cho, Hye Sun (Ginseng Resources Institute, Korea Ginseng Corp.) ;
  • Lee, Hyang Burm (Division of Applied Bioscience & Biotechnology, College of Agriculture & Life Sciences, Chonnam National University) ;
  • Yu, Seung Hun (Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University)
  • Received : 2014.09.24
  • Accepted : 2014.11.29
  • Published : 2015.03.01
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Abstract

In 2011, a leaf blight disease was observed on cosmos (Cosmos bipinnatus) leaves in Nonsan, Korea. The causal pathogen was isolated and identified based on morphological and molecular approaches. Morphological characteristics of the pathogen matched well with the Alternaria cosmosa and also easily distinguishable from Alternaria zinniae reported from cosmos seeds by producing branched beak. Phylogenetically, the pathogen could not be distinguished from A. passiflorae based on the sequence analysis of a combined data set of Alt a1 and gpd genes. However, A. passiflorae was distinguished from the present species by having conidiophores with 4 to 5 conidiogenous loci. The results indicate that the present Alternaria species is A. cosmosa. Pathogenicity tests revealed that the isolate was pathogenic to the leaves of Cosmos bipinnatus. This is the first report of Alternaria blight disease caused by A. cosmosa on cosmos in Korea.

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References

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