Answer: It would be difficult to identify the larvae without seeing it, but I expect you've taken care of the problem by cleaning out the wound. Although you've already sealed the wound, I wouldn't recommend using any foreign material in a tree wound. It takes time, but if the tree is healthy it will compartmentalize the wound and seal it off. By applying canned foam, which expands and dries hard, the tree won't be able to heal the wound. Since it's an old tree, it may not matter so much, buta young tree should always be given an opportunity to heal and seal its own wounds. Keep watching for insect populations in or near the tree so you can nip the problem in the bud.
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