Carpenter Bees Activity Increasing
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Collapse ▲Recent warm temperatures have led to increased activity by carpenter bees. The initial activity is typically by the males who are busy buzzing about waiting for the lady bee of their dreams to make her appearance. The males can be territorial and will harass people sitting on wooden park benches, porches or near other areas where the bees were busy last year. The males have a white spot in the middle of their “foreheads” and you can actually spot it if the bees hover around you.
People are likely to see new holes being bored as well as possibly old galleries being cleaned out. The key sign of activity (other than the bees themselves) is the very coarse sawdust-like debris found nearby, along with splatterings of carpenter bee excrement.
Unfortunately, there is nothing new on the control front. If anything, the pyrethroid insecticides such as permethrin, bifenthrin and cyfluthrin, which are the active ingredients in the products made by Spectracide, Ortho and Bayer Advanced, applied to exposed wooden surface may provide some repellency, but NC State University Entomologists believe it would probably be short-lived in its impact. Again, the major problem is twofold:
- having an effective chemical residue that endures throughout the entire period of bee activity, and
- being able to apply any pesticide to all of the surfaces that need protection, particularly overhead on soffit and fascia boards.
Other than swatting the bees, your next best option is to apply a pesticide into active galleries. Dust insecticides, such as Sevin Dust (or permethrin dust) can be quite effective. Wait about 24 hours after application before sealing up the holes to make sure you get bees entering the treated openings. This is likely not done by many people since it means a second trip up the ladder on successive days. You can wait longer, but it’s a good idea to seal the holes to keep out moisture.