Notes on powdery mildews (Erysiphales) in Japan: III. Golovinomyces and Podosphaera

•Golovinomyces cynoglossi is reported as a new species in Japan.•Three new host plants of powdery mildews are reported with morphology.•Morphology of powdery mildews on five host species is first reported.

Several new records of Golovinomyces and Podosphaera species (Erysiphales) in Japan are reported with morphological and molecular data, including the first finding of G. cynoglossi in Japan, the first occurrence of Euoidium sp. on Trigonotis peduncularis, G. riedlianus on Galium trifloriforme var. nipponicum and P. xanthii on Verbena brasiliensis, as well as the first morphological descriptions and molecular data for G. rubiae on Rubia hexaphylla, P. curvispora on Aria alnifolia, P. tridactyla on Cerasus leveilleana, and P. xanthii on Parasenecio hastatus subsp. tanakae and V. bonariensis based on Japanese specimens.