Identify the type: carpenter bees (large, shiny black/blue with smooth abdomens; wood-boring holes)
Confirm active use: look for fresh sawdust piles under holes and fresh entrance activity
Stop immediate damage: plug holes temporarily with steel wool and replace after a few days if activity continues
Remove bees safely: spray a direct, labeled insecticide for carpenter bees at the entrance during dry, calm weather
Use a residual dust or spray labeled for wood-infesting bees, applied per label directions
For active galleries at the entrance: inject an approved aerosol/insecticide labeled for carpenter bees directly into tunnels
Seal after bees are gone: fill holes with wood filler/epoxy and paint to match once activity stops
Remove attraction: paint or seal unfinished wood, especially exposed beams, fences, decks, soffits, and trim
Repair damaged wood: replace rotted/soft wood and sand smooth surfaces
Reduce nesting sites: install metal flashing where bees commonly enter
Increase protection: apply a penetrating wood preservative/sealer to bare wood
Use deterrents: hang bee-repellent devices only if they are labeled/effective for carpenter bees in your area
Use physical barriers: install perforated screens or mesh over openings (where appropriate and not trapped behind siding)
Time the treatment: target late summer to early fall for control, and seal holes when you confirm no activity
Avoid DIY traps with standing water or unapproved poisons near pets and children
Consider professional help if holes are widespread, in structural framing, or you cannot safely access areas
Maintain aftercare: re-check entrances every few days after treatment and re-seal as needed
Do not use pesticides outdoors contrary to label instructions or during windy/rainy conditions