AA lot of good information on that site. That said, you need to fill the holes after you kill all of the bees and larva in the holes.After you poison the holes and you haven't seen an activity, I recommend you fill the holes with steel wool and caulk. You need to fill the holes or they will just come back next year. I recommend you paint over the site if you can. Stain works pretty well as a deterrent, but from my experience paint is much more effective.