Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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New Downy Mildew Disease Caused by Hyaloperonospora brassicae on Pak choi (Brassica rapa) in Korea

  • Received : 2019.06.14
  • Accepted : 2019.06.18
  • Published : 2019.06.30
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Abstract

Pak choi (or a Bok choy; Brassica rapa subsp. chinensis) is a popular brassicaceous vegetable worldwide. In January 2019, a downy mildew symptom on pak choi was found at a farm located in Yongin, Korea. Based on morphological characteristics and molecular phylogenetic inference, the pathogenic oomycete was identified as Hyaloperonospora brassicae. To our knowledge, this is the first report of downy mildew disease occurring on pak choi in Korea. Considering the increasing demand for this crop, this pathogen would be a potentially new threat to the cultivation of pak choi in Korea.

Keywords

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Fig. 1. Downy mildew disease caused by Hyaloperonospora brassicae on pak choi (Brassica rapa subsp. chinensis).

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Fig. 2. Minimum evolution trees based on the internal transcribed spacer rDNA and cytochrome oxidase II mtDNA sequences. Bootstrapping values higher than 70% are given above the branches. Downy mildew pathogen of pak choi (Brassica rapa subsp. chinensis) is shown in bold. The scale bar equals the number of nucleotide substitutions per site.

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