You can inject a Bore Killer (Insecticide) with a syringe into the holes. However, you will need to decide if there is enough left on the tree to warrant the treatment.
I lost a beautiful Picea that I named "Thunder" to wood borers. You can see it at:
http://members.aol.com/iasnob/thunder.html
Cordially,
Michael Persiano
members.aol.com/iasnob
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