Characteristics of powdery mildew  Powdery mildew is a common fungal disease that infects a broad spectrum of plants, including trees and shrubs, perennials, grasses, fruits and vegetables. It is not a single disease but is caused by a group of related fungi in the Erysiphaceae family. Regardless of the fungal source, the appearance of the … Continue reading Powdery mildew on ornamental plants