Wilting Dogwood...

     Hi All,
I have a mature dogwood tree whose leaves are wilting and curling. All leaves on the tree are doing this. The lower leaves have black spots and many are now turning a dark purple and falling off. There is no white powdery stuff on the leaves. Any ideas on the culprit?
I live in zone 5. No drought conditions. In fact been getting quite a bit of rain lately. No other shrubs, plants, or trees around have the symptoms of the dogwood. Although, I do have a lilac nearby with some yellowing, curling leaves. Also, seems like I remember the tree doing the same thing last year. But, didn't really pay it much attention.
Any input is much appreciated. -Chris Swartz
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