Erysiphe magnoliicola Comprises the Powdery Mildew Found on Magnolia kobus in Korea

In-Young   Choi1   Lamiya  Abasova2   Joon-Ho   Choi1   Byoung-Ki  Choi2   Hyeon-Dong  Shin3,*   

1Department of Agricultural Biology, Jeonbuk National University, Jeonju 54896, Korea
2Warm-Temperate and Subtropical Forest Research Center, National Institute of Forest Science,Seoguipo 63582, Korea
3Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Korea


The powdery mildew found on Magnolia kobus was recorded as Microsphaera alni for the first time in Korea in 1975. After splitting M. alni into several distinct species, this mildew was regarded as Microsphaera magnifica, now Erysiphe magnifica. Since E. magnifica is known to be a North American species, the powdery mildew found on M. kobus in Korea was studied to clarify its identity. Based on morphological characteristics and sequencing results of the internal transcribed spacer and large subunit rDNA gene, the powdery mildew found on M. kobus in Korea was identified as Erysiphe magnoliicola.

Figures & Tables

Fig. 1., a powdery mildew found on . A-C: Conidiophores. Note the hyphal septa, indicated by yellow arrows. All images are presented at the same magnification. D: Conidia. E: Conidia in germination. D and E comprise the same magnification. F: Numerous chasmothecia formed on the lower leaf surface. G: Close-up view of chasmothecia. H: Chasmothecium with 15 appendages. I: Chasmothecium with asci and ascospores. H and I are presented at the same magnification.