Carpenter bees are solitary bees that make wooden nests. They look like bumblebees, but their abdomen is bare and shiny black instead of hairy. Carpenter bees can sting, but are generally not aggressive. The female bee carpenter drilling a perfectly round hole the size of your thumb in a wooden surface, then bored of branches called galleries. The branches are packed with a pollen ball that feed on larvae and adult bees emerge next spring to begin a new cycle.
Things you need
Paint or stain
Carpenter bee repellent
Paint or stain bare wood, or use pressure-treated wood. Carpenter bees are attracted to bad weather, unpainted wood. They are less likely to attack pressure treated wood, or wood that has been painted or stained. Painting is a more effective deterrent than the stain.
Mixing paints or stains with products formulated to repel carpenter bees. Follow the manufacturer’s instructions for application.
Spray susceptible wood with insecticide sprays in early spring, when women carpenter bees are looking for new nesting sites. You may need to repeat the treatment as some sprays are only effective for a week or two.
Seal the hole using a wooden dowel and wood pulp, and then repaint. Carpenter bees return to nesting holes year after year.
Close doors structures such as sheds and garages. Carpenter bees can attack exposed beams inside.
Tips & Warnings
Killing the larva in the holes with insecticide powder before sealing. You want to kill the larva first rather than just seal the holes, because the adult bees emerging box bore new holes to escape.
Female carpenter bees sting to defend their nests, to address any holes you find at night. The adult bee will be inside the nest, and less likely to sting.