Powdery mildew of Sneezewort (Achillea ptarmica L.) occurred in Tokyo in 2007. The pathogen on was identified as Golovinomyces cichoracearum (de Candolle) Geljuta var. cichoracearum based morphological characteristics. An inoculation test confirmed this fungus as the causal agent of the disease. This is the first report of the disease in Japan.
