Powdery mildew is a common disease on many types of plants. Powdery mildew fungi generally do not require moist conditions to establish and grow, and normally do well in warm climates. Thus they are more prevalent than many other diseases in California's dry summer weather. It can be serious on woody species such as grapevines, caneberries, and fruit trees where it attacks new growth including buds, shoots, and flowers as well as leaves.
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