First report of downy mildew caused by Plasmopara viticola on Vitis ficifolia var. sinuata in Korea.
Typical symptoms of downy mildew were first detected on Vitis ficifolia var. sinuata vines growing in the wild, around a pond in Gunsan, in September 2015, and then in Jeju, Korea Republic, in October 2016, where temperatures ranged from 10 to 23°C. Infected leaves turned yellow or paler green than normal and revealed vein-limited, angular spots on the upper surface, with a whitish fungal growth developing abaxially. As the disease progressed, leaves appeared wilted and turned reddish to brownish. The causal pathogen was identified as Plasmopara viticola based on morphological, molecular and pathogenicity analyses. This is thought to be the first report of downy mildew caused by P. viticola on V. ficifolia var. sinuata in Korea Republic.