Erysiphe quercicola Causing Powdery Mildew on Quercus rubra in Korea

Young-Joon   Choi1   Jun Hyuk  Park1   In-Young   Choi2   Lamiya   Abasova2   Joon-Ho   Choi2   Dong-Hyeon  Lee2   Chang Sun  Kim2,3,*   

1Department of Biological Science, Kunsan National University, Gunsan 54150, Korea
2Department of Agricultural Biology, Jeonbuk National University, Jeonju 54896, Korea
3Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Korea


In Korea, powdery mildew has been observed on Quercus rubra, commonly called the northern red oak tree. Based on its morphological and molecular phylogenetic analyses, the fungal agent was identified as Erysiphe quercicola, but it was distinct from the other four Erysiphe species, specialized to Quercus species. This is the first confirmed report on the identity of powdery mildew found on Q. rubra in Korea. This finding can help understand the host expansion of E. quercicola and the biodiversity of powdery mildew on Quercus species.

Figures & Tables

Fig. 1. causing powdery mildew on Quercus rubra. A: Affected tree showing powdery mildew symptoms. B: Close-up of affected leaves. C: Fallen leaves with powdery mildew symptoms. D: Appressoria on a hypha. E-G: Conidiophores. Arrows indicate septa. H-J: Primary conidia. K-P: Conidia. Q-R: Germinating conidia.