A downy white fungal growth, powdery mildew attacks a wide variety of trees and shrubs as well as ornamental plants, indoors or out. Powdery Mildew coats the trees leaves blocking the process of photosynthesis which turns light into food for trees and shrubs. Although any tree can get this common disease, the ones that are most commonly affected are oak, maple, dogwood, magnolia, catalpa, and crabapple. How to Identify Powdery Mildew Damage. A powder on olive tree leaves - Answered by a verified Landscaper. White powder on leaves is usually powdery mildew. ; Powdery mildew usually starts off as circular, powdery white spots, which can appear on leaves, stems, and sometimes fruit. ; Powdery mildew usually covers the upper part of the leaves, but may grow on the undersides as well. Plants infected with powdery mildew look as if they have been dusted with flour. These newly produced leaves must then replenish the food supply through photosynthesis. 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