Are they in the bark, sapwood, or deeper. I use a lot of locust and leave it stored outdoors, bark on. I find borer type bugs sometimes, but they have never been deep, and so long as I was chasing a ring, all bugs and damage were removed easily. It is sometimes pretty yucky on the draw knife, but that is all. Never looked for type or cause or anything since they were never a real problem.
Now that I think on it, I never brought the wood inside to season to keep the bugs out - but wonder now if they got the bugs because the wood was stored outside. Hmmmmm........
Russ