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Apple Disease - Powdery Mildew

Prepared by Frank Zalom, Emily Symmes, Mark Henderson and Mark Bell, July 2009 - UC Davis Powdery mildew (Podosphaera leucotricha) is a fungal disease of apples and pears. The white clusters of mycelium and spores produce its “powdery” appearance. The disease affects apple tree buds, leaves, twigs, blossoms and fruits. In order to develop, powdery mildew relies on temperatures between 19-22 . The disease can grow in both moist and dry humidity.

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