Red Oak dropping leaves


My Red Oak tree has started dropping clumps of dead leaves. The problem started in the crown about 8 weeks ago, and was dropping clumps of green leaves, now it is dropping clumps of brown leaves as well as green. It is also dropping sap from the places where the leaves drop. The tree is starting to look really thin, and the problem is definitely getting worse. Swingle said it had kermes scale, and treated it, but I think this is a different problem, and I fear we will lose this tree. Any help you can give in diagnosis and / or treatment is greatly appreciated.

Thank you,



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