Powderpost beetles, a species of wood-boring beetle, grow from larvae in the crevices of wood and eat their way out. Sawdustlike frass sticks together and is found tightly packed in galleries but not in entrance holes. A certain sign of their presence is numerous small holes about 1/16-to 1/8-inch in diameter and a fine, powder-like sawdust in flooring, paneling, furniture, and other wood materials. Foreign grain beetles are one of a group of beetles that feed on molds and fungi growing on poorly seasoned lumber or wet plaster and wallboard. 2 Lyctid powderpost beetles. Many species also have tiny, roughened, rasp-like protrusions behind the head, and some have a pair of projecting spines at the end of the body. Lyctid powderpost beetles are small (1/16-1/4 inch), narrow and elongated, reddish-brown to black beetles (Figure 2). Rough-cut lumber should be kiln-dried to kill all stages of the beetle. The holes are the openings through which the adult beetles emerge. The powdery dust feels like flour or fine talc, and often accumulates in small piles beneath or beside emergence holes. ), is made from softwood and is unsuitable for infestation by lyctids. A 13-30% moisture content is required for development of the larvae. New exit holes will have the color of freshly sawed wood. Consequently, infestations are often associated with flooring, paneling, molding, window and doorframes, and furniture. Lyctid Powderpost Beetles. While it would be difficult to kill wood-boring beetles in ‘built in’ components like floors and cabinets, de-infestation of furniture and similar objects may be possible within a heat chamber. Anobiid powderpost beetles prefer to lay their eggs in cracks, old beetle exit holes, or under wood splinters. Identification. Construction plywood (used for subfloors, sheathing, etc. Lyctid powderpost beetles will usually only attack hard woods, although they have been reported in some soft woods as well. Powderpost beetle (Acantholyctus cornifrons)Photo: Pest and Diseases Image Library, Bugwood.org. As a result, the pests may cause considerable confusion for homeowners, wood suppliers, manufacturers, builders, and even pest control companies. When new homes are constructed, microscopic surface molds form on damp wood and sheetrock, which in turn attracts the beetles. This makes particular sense when attempting to determine whether an infestation is active during fall or winter. There is little risk to softwood framing within homes. Powderpost beetles get their name due to the fine, flour-like residue the larvae leave behind when they bore holes in wood materials. Because their damage can look similar to the damage caused by other pests like termites, carpenter ants, and even carpenter bees, wood boring beetles like the powder post beetle often get misdiagnosed, which prolongs proper treatment and may lead to more damage. Dispose of empty containers right away, in a safe manner and place. If this is the case and the entire floor needs to be sanded and refinished, it is often prudent to wait at least six months in case more holes appear and additional boards need replacement. They are slender and range in color from reddish-brown to black. Depending on the species of beetle, the frass can either be extremely fine — like flour or baby powder — or slightly gritty like cornmeal. The longer wood sits in a vulnerable condition, the greater the chance beetles will find and lay eggs on the lumber. Each group contains several species capable of damaging wood materials. For property owners and manufacturers, prevention is less costly than treatment. Powderpost Beetle Scientific Name: Lyctoxylon dentatum Powderpost Beetle Facts. Wood infested with powder post beetles contains many round holes (called shot holes) that are 1/32 to 1/8 inch in diameter. 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