Heavy sap flow from pruning wounds on maples in spring is normal—root pressure pushes sap upward. It stops within weeks as leaves transpire. Don't apply wound dressings; they slow healing.
To prevent borers attracted to the sap, spray wounds with imidacloprid (Merit). Borers target stressed trees, so fertilize with 10-10-10 at 1 lb per inch of trunk diameter. The sap flow itself doesn't harm the tree.
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