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Dahlia leaf with white patches of the powdery mildew fungus, Erysiphe cichoracearum.

White, fluffy patches of powdery mildew on upper surface of dahlia leaf. ; Monterey County Credit: Steven T. Koike — Dahlia leaf with white patches of the powdery mildew fungus, Erysiphe cichoracearum. Credit: Steven T. Koike

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