Answer: Powder Mildew fungi thrive under conditions of high relative humidity, warm temperatures, low light, high fertility and succulent plant growth. Pumpkins and melons vary in their resistance to powdery mildew; the best defense is to provide full sunshine and ample air circulation between the plants. Resistant cucumber varieties include 'Calypso', 'Cherokee', 'Dasher II', 'Monarch', and 'Supersett'. 'Senator' is a resistant zucchini.
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