That's the worst. I had the same thing happen with about 600BF of quarter sawn red oak. Kept it in the garage for about a year (was stored outside at the mill) - went to se it and powder everywhere. I moved the stack board by board to another part of the garage, sweeping off the dust and saturating each side with timbor as I restacked it. About six months later, I used some of the wood and there was no new activity. The loss was not as bad as I thought as, for the 10 or so boards I've surfaced so far, I'm still getting 1/2" to 3/4"+ boards once I remove all the bore holes. Most of the damage was on the edges - usually the sap wood edge, so I lost more width than thickness, though there were some spots that were total losses as well.
I chose to use timbor at the time as I had a 5-gallon bucket of timbor powder. All that said, I'm not sure how much of a difference the timbor made in stopping the activity as I think the wood may have been too dry for re-infestation at that point because I keep a dehumidifier in the garage and keep it at a pretty consistent 35% or less year round (keeps my cast iron ops rust free).
