First report of powdery mildew caused by Neoerysiphe nevoi on Hypochaeris radicata in Korea.
In June 2015, dozens of catsear (Hypochaeris radicata) plants growing wild in Jeju, Korea Republic, were found infected with a powdery mildew. Symptoms first appeared as white colonies, which subsequently developed into abundant hyphal growth on flower stalks but not on leaves. Similar symptoms and signs with typical powdery mildew colonies were also found at 2 localities in Jeju. The causal pathogen was isolated and identified as Neoerysiphe nevoi based on morphological, molecular and pathogenicity analyses. The obtained sequences were deposited in GenBank (accession nos. MH685457 and MH685458). This is thought to be the first report of powdery mildew caused by N. nevoi on H. radicata in Korea Republic.