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POSTERS: Mycology I

P-421 - First Report of Venturia causing leaf spot on Euonymus alatus in South Korea

Monday, August 4, 2025
4:30 PM - 5:15 PM HST
Location: Exhibit Hall 3

    Presenting Author(s)

  • SL

    Sang-Hyun Lee

    National Institute of Forest Science
    Seoul, Seoul-t'ukpyolsi, Republic of Korea

    • Author(s)

  • SK

    Sieun Kim

    National Institute of Horticultural & Herbal Science
    Wanju, Cholla-bukto, Republic of Korea

  • KP

    Ki Hyeong Park

    National Institute of Forest Science
    Seoul, Seoul-t'ukpyolsi, Republic of Korea

  • SS

    Sang-Tae Seo

    National Institute of Forest Science
    Seoul, Seoul-t'ukpyolsi, Republic of Korea

  • JK

    Jiwon Kim

    National Institute of Forest Science
    Seoul, Seoul-t'ukpyolsi, Republic of Korea

Abstract Text:

Euonymus alatus (Celastraceae), known as burning bush, has been widely cultivated as ornamental shrub in urban environments. Recently, circular leaf spot symptoms, characterized by olive green to dark brown concentric lesions, were observed on E. alatus in South Korea. Both macroscopic and microscopic features were similar to Venturia species. The phylogenetic analysis based on the concatenated sequences of internal transcribed spacer (ITS) and large subunit (LSU) of rDNA regions identified the pathogen as Venturia inaequalis. Pathogenicity tests fulfilled Koch’s postulates, demonstrating the pathogen's ability to reproduce symptoms under field conditions. To our knowledge, there are no recorded cases of plant diseases in Euonymus species caused by Venturia species. This is the first report of V. inaequalis causing leaf spot on E. alatus in South Korea. This identification underscores the importance of disease monitoring and management of this ornamental plant.