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New Downy Mildew Disease Caused by Hyaloperonospora brassicae on Pak choi (Brassica rapa) in Korea

Lee, Hyun Ju;Lee, Jae Sung;Choi, Young-Joon

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

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

Brassica;downy mildew;Oomycota;pak choi;phylogeny

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)