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Wood Borers

Powderpost Beetles

Anobiid Powderpost Beetles

Anobiid Powderpost Beetles

Anobiid powderpost beetles are usually about 1/16 to 1/4 inch long, reddish brown or grayish brown to dark brown.

Most commonly, infestations of Anobiid powderpost beetles are found in structural timbers made of softwood, such as beams, sills, joists, studs, subflooring, and plywood. In addition, Anobiids will infest hardwood furniture, wall paneling, window and door molding, hardwood floors, and furniture. Woods such as maple, beech, poplar, and pine are especially susceptible to attack. They prefer to infest wood with high moisture content in poorly ventilated areas in crawl spaces of houses, utility rooms, and garages. Under favorable conditions, the infestation then spreads into walls and other areas of the structure. Infestations develop slowly but wood can be reinfested year after year.

 

Bostrichid Powderpost Beetles

Bostrichid Powderpost Beetles

Bostrichid powderpost beetles are 1/8 to 3/4 inch long, reddish brown to black in color. The round emergence holes are 1/8 to 3/16 inch in diameter. Sawdust-like frass sticks together and is found tightly packed in galleries but not in entrance holes.

Bostrichids infest seasoned softwood and hardwood; especially unfinished floors, window sills, furniture, etc. Bamboo items are especially susceptible to attack by some species of Bostrichid beetles.

 

Lyctid Powderpost Beetles

Lyctid Powderpost Beetles

Lyctid powderpost beetles are about 1/4 inch long, brown in color, body elongated and slightly flattened, prominent head not covered by pronotum, and antennae with a 2-segmented terminal club.

Lyctids infest the sapwoods of hardwoods; mainly ash, hickory, oak, maple, and mahogany. Consequently, most infestations are found in wood paneling, molding, window and door frames, hardwood floors, and furniture. Imported tropical hardwoods are especially infested with Lyctids because of poor storage and drying practices prior to shipment to the U.S. Joists, rafters, and subfloors of houses are not usually infested with Lyctids because they are usually made of pine or other softwoods.

Lyctids rarely infest wood older than 5 years. Therefore, infestations are usually in new homes or newly manufactured articles. Infestation usually results from wood that contained eggs or larvae at the time of purchase. Typically the item was made from wood that was improperly dried or stored.

 

Old House Borers

Old House Borer

The adult old house borer is grayish-black, 1/2 to 3/4 inch in length with several white markings on the wing covers and long antennae. The female lays eggs in crevices of logs or timbers. The larvae hatch and require 3 to 5 years or more to mature. The larvae are 1/2 to 1 1/2 inches long and are white, segmented and have an enlarged, brownish head. They bore through the wood making irregular galleries.

During quiet times, their feeding may be heard as a clicking or rasping sound. The beetles emerge through an oval hole about 1/4 to 3/8 inch in diameter.

 

Carpenter Bees

Carpenter Bee

Carpenter bees are 3/4 to 1 inch long and closely resemble bumble bees except that their abdomen is a shiny metallic greenish-black; whereas, the abdomen of bumble bees is very hairy. These insects sometimes build their nests in solid wood such as weather boarding, railings, supports, and trim of buildings. Their nests are in the form of tunnels 3 to 6 inches deep in the wood. The entrance hole is about 1/2 inch in diameter. The holes are very clean and appear as though they were made by a drill. Damage to wood is seldom extensive.

Carpenter bees can be controlled by removing and replacing infested wood. Painting, staining, or filling holes with putty does not usually prevent the bees from digging a new tunnel. Insecticides can be used to treat areas of wood where carpenter bees are active.