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First Report of Powdery Mildew Caused by Cystotheca wrightii on Quercus glauca in Korea
1Plant Clinic, College of Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Korea.
Plant Disease
|February 3, 2019
Summary
A new powdery mildew, Cystotheca wrightii, was identified on Japanese blue oak (Quercus glauca) in Korea. This finding is significant as it represents the first record of this fungal pathogen in the country.
Area of Science:
- Plant Pathology
- Mycology
- Botany
Background:
- Quercus glauca (Japanese blue oak) is a dominant tree species in East Asian evergreen forests.
- Powdery mildew infections were observed on Q. glauca in Jeju Islands, Korea, in May 2012.
- Symptoms varied on overwintered and current-year leaves, including dark, felt-like growths and white patches.
Purpose of the Study:
- To identify the causal agent of the powdery mildew affecting Quercus glauca in Korea.
- To characterize the morphological and molecular features of the pathogen.
- To document the first occurrence of this specific powdery mildew in Korea.
Main Methods:
- Morphological analysis of fungal structures, including special aerial hyphae, conidiophores, conidia, chasmothecia, asci, and ascospores.
- DNA extraction using the Chelex method and amplification of the internal transcribed spacer (ITS) region of rDNA.
- BLAST search against GenBank for sequence homology confirmation.
Main Results:
- Morphological characteristics, particularly falcate aerial hyphae, were consistent with Cystotheca wrightii.
- The ITS rDNA sequence (GenBank Accession No. KF735066) showed 100% homology with C. wrightii isolates from Japan.
- This marks the first documented report of C. wrightii on Q. glauca in Korea.
Conclusions:
- The powdery mildew identified on Quercus glauca in Korea is Cystotheca wrightii.
- The presence of C. wrightii in Korea, previously known only from Japan, Taiwan, and China, is confirmed.
- This finding may pose a potential threat to other evergreen oak species in southern Korea.
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