Erysiphe pulchra
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Author(s): John Hartman, University of Kentucky
Source: IPM Images
Erysiphe pulchra (Cooke & Peck) U. Braun & S. Takam. (2000)
This fungus is widely distributed and causes powdery mildew, mainly on dogwood (Cornus species). In North America, it seriously damages flowering dogwood (Cornus florida), a small tree, popular as an ornamental. Powdery mildew symptoms appear on the upper side of the leaves and result in necrosis of young leaves, as well as in reduced flowering, fruit production and tree growth.
Starting in 1993 and 1994, infections by powdery mildew became common in south-eastern North America and reached epidemic levels by 1995. This and other observations suggest that E. pulchra might have been introduced into North America. During the epidemic both sexual and asexual forms were observed, but the sexual stages became less frequently and surveys around 2015 indicated that E. pulchra now reproduces predominately via asexual conidia in North America (Wyman et al., 2019).
Synonyms:
Microsphaera pulchra
