Powdery mildews, caused by various species of fungi (Family Erysiphaceae), can affect trees, shrubs, roses, perennials, annuals, bulbous plants, vegetables, fruits and many indoor plants. Each species of powdery mildew affects only specific types of plant. However a few plants are susceptible to more than one type of powdery mildew. Powdery mildews are particularly prevalent under dry soil conditions and when days are warm and dry followed by cold nights. For many plants, most severe attacks can occur in early autumn at the end of the growing season.
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