First report of powdery mildew caused by Podosphaera elsholtziae on Ajuga reptans in Korea.
In September 2015, hundreds of Ajuga reptans individuals of an unknown cultivar grown in a public garden in Mokpo, Korea Republic, were found damaged by a powdery mildew with approximately 50% disease incidence. Symptoms first appeared as white colonies, which subsequently covered both sides of leaves, detracting from the aesthetic value of affected plants. Chasmothecia were abundantly formed by November. The causal pathogen was identified as Podosphaera elsholtziae based on morphological, genetic and pathogenicity analyses. This is thought to be the first report of powdery mildew caused by P. elsholtziae on A. reptans in Korea Republic.