Mildew

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1. A plant disease in which the casual fungus forms a coating over the surface of plant parts. The coating, which is a mycelial (mycelium) growth, is usually thin and whitish. There are two types of mildew - downy and powdery.

dark%20mildew.JPG

A sample of a typical dark mildew on a leaf surface of po‘ola.
Source: http://www.botany.hawaii.edu/faculty/gardner/diseases/dark%20mildews/dark_mildews.htm