Erysiphe russellii in Korea supported by new morphological and sequence analyses

摘要

Morphological and rDNA ITS sequence analyses were conducted on three strains obtained from leaf lesions on creeping wood sorrel (Oxalis corniculata) covered by a powdery mildew. No chasmothecia were observed, but the symptoms and traits of conidiophores and conidia agree wellwith those of Erysiphe russellii (previously recorded from Korea as Microsphaera russellii). Phylogenetic analysis shows that the three strains share 97.9-98.06 % identity with Erysiphe pisi (FJ378867) but form a separate E. russellii clade with a sequence of thatspecies based on Japanese material. This supports the occurrence of Erysiphe russellii in Korea.