A few years ago I noticed these stains on the leaves of the tree. Each year they bseem to get progessively worste.
The white stains are fungus. Your maple tree is probably infected by some kind of bacteria – it could just be from air currents. You can click on this link and look on the “Powdery Mildew” section for more information about damage control: http://www.ag.ndsu.edu/pubs/plantsci/hortcrop/pp697-1.htm
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