Powdery mildew

Erysiphaceae is a family of ascomycete fungi in the order Helotiales. The members of this family are obligate parasites with a superficial mycelium that forms a characteristic white, powdery coating on their host plants.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 2.0

TREEURBAN

Urban trees, green spaces, and the art of city gardening.

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