While there are chemical remedies for powdery mildew, few home gardeners need to use them; these controls are usually reserved for commercial farming operations. Instead of a cool, moist environment, powdery mildew prefers warm and dry conditions where there is high humidity combined with moderate temperatures. A better solution for home gardeners is simply to follow good cultural practices and, if desired, to apply a simple homemade powdery mildew spray. Spores of powdery mildew spread by wind and can survive the winter in plant debris or compost piles. Make sure to dispose of infected plants and leaves to help prevent future outbreaks.

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Source: The Spruce