Problems of Crabapple Leaves Covered With White Powder Powdery Mildew

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Leaves Covered With White Powder
Powdery Mildew - Powdery mildews are caused by fungi that live on the surface cells of the crabapple leaves, not inside them. Infected leaves are covered with a white or ash-gray powdery mold. Badly infected leaves become discolored and distorted, then drop off. It makes them unsightly, but is not life threatening to mature trees. Powdery mildews thrive in either very humid or very dry weather and on foliage that does not enjoy good air circulation.

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