Answer: The seeping sap indicates injury to the tree, perhaps from borers. Without actually seeing the insects, I can't really identify them. Collect a few and take them to your local nursery or cooperative extension office for positive identification. Once you know what the pests are you can use a pest-specific insecticide to control them. Then, with the bugs gone, the tree can begin to heal itself. As soon as it can seal up the injuries, it should not seep sap. Best wishes with your landscape!
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