Common Foliage Diseases of Hardwoods in North Carolina
In general most of these diseases seldom cause serious damage to trees and rarely cause mortality. Defoliation may result from a number of foliage diseases especially in unusually favorable weather conditions. Repeated defoliations in successive years can stress trees sufficiently to allow other, often secondary pathogens, to infect the weakened plant and lead to growth inhibition or mortality. Specific information is provided about three different clases of foliar diseases, at the links below.

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Anthracnoses

Leaf Blister, Leaf Spots, and Sooty Mold

Powdery Mildews (overview)

Powdery Mildews (in detail, by Karen Monroe)