Answer: Norway Maples (Acer platanoides) are susceptible to a wide number of fungal and bacterial leaf problems, and a cool wet spring can certainly contribute to their development. Some of these are quite serious and some are not. Unfortunately, it's risky to try and diagnose your tree's problem without actually seeing the leaves. You may wish to take a sample leaf and small branch to your local County Extension office (ph# 412/350-2540) to obtain a positive identification of the problem and their current recommendations (if any) for treating it. As long as your maple is well grown, and not a newly planted or young sapling, it can tolerate leaf loss without too much damage - I've seen trees completely defoliated by gypsy moths leaf out fully the next year. Good luck!
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