Powdery mildew of campfire crassula (Crassula capitella) caused by Pseudoidium sp. (Erysiphe anamorphs)

Abstract

Powdery mildew of campfire crassula (Crassula capitella subsp. thyrsifolia) occurred in Ibaraki prefecture in March 2014. We analyzed pathogenic-ity, morphological characteristics and rDNA-ITS region of the causal agent of the disease, and iden-tified the causal agent as Pseudoidium sp. We for-mally named the disease 'powdery mildew of camp-fire crassula' as a new disease of the plant in Japan.