Powdery mildew consist of variety of fungal species which infect and cause diseases in various species of plants.
These diseases get their name from the powdery spores that appear on infected leaf surfaces.
Symptoms usually begin on the older, lower leaves. As their capacity to conduct photosynthesis is hurt, plants may lose their color. Leaves may wither and die as the disease progresses. Powdery mildew symptoms and outbreak conditions vary from species to species.