Identify and seal entry holes in untreated wood
Replace or paint exposed bare wood surfaces
Fill old holes with wood filler or caulk
Apply residual insecticide labeled for carpenter bees to nesting areas
Use dust insecticide in active tunnels at dusk or night
Install carpenter bee traps near problem areas
Hang decoy nests to discourage new nesting
Remove or cover exposed wood trim, fascia, and eaves
Keep wood surfaces sealed, stained, or painted
Reduce nearby flowering plants if bees are highly active around the structure
Call a licensed pest control professional for severe infestations