First record of Erysiphe pulchra in China on a new host species.
Erysiphe pulchra (Erysiphe sect. Microsphaera) was identified on Cornus kousa subsp. chinensis (≡ Dendrobenthamia japonica var. chinensis). This is the first record of this species in China, and C. kousa subsp. chinensis is a new host plant for E. pulchra. The Chinese specimen is described, illustrated, and discussed and its affinity has been confirmed using molecular methods.