How To Kill Carpenter Bees

If you do have an active carpenter bee & infestation, following these steps below would ensure success.

Mix the Avesta CS at 0.4 ounces (12 ml) per gallon of water and spray the areas where carpenter bees are boring or have bored in the past. The goal here is to use a spray pattern that clings to the surface. This will leave a repellent residue on the surface which will discourage the bees from drilling additional holes. Their holes are usually located on the underside of any wood surface including siding, soffits, overhangs, decks, fence posts, fascia boards, and window frames. We recommend spraying twice during the spring at intervals of 34 weeks. For severe infestations of carpenter bees on cedar and log structures, you may need to treat them more frequently.
Next, fill the duster about halfway with Tempo 1% Dust and puff it into all accessible carpenter bee holes. Shake the duster vigorously and puff it 2 or 3 times into each hole. Holes that are too high to reach with the duster may have to be sprayed using the sprayer and the Avesta CS. Setting the sprayer nozzle to a stream will allow it to shoot much farther. Sometimes carpenter bee holes will be behind shutters, trim boards, gutters, etc. Dust or spray the area around their access point so that they have to crawl through some insecticide to get in or out.
I know it’s tempting to seal the holes now, but we recommend waiting until the fall. This gives any surviving eggs or adults time to hatch and leave. When sealing the holes, be sure to use a sealant that can be painted over. Always read and follow the label instructions.


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