In late summer, lilacs can be attacked by powdery mildew, specifically " Erysiphe syringae ", one of the Erysiphaceae.
2.
""'Sawadaea tulasnei " "'is a form of powdery mildew is a species of fungus in the family Erysiphaceae.
3.
At least three other Erysiphaceae fungi can cause powdery mildew in cucurbits : The most frequent, after " P . xanthii ", is " Erysiphe cichoracearum ", the former primary causal organism throughout most of the world.
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