General Decayed softwoods and hardwoods in damp conditions - poorly ventilated ground floors, cellars, and wood in contact with damp solid floors or walls are particularly susceptible. Damage secondary to fungal decay. Also attacks plywood in these conditions.
Emergence holes Small, ragged, about 1 mm diameter.
Tunnels Numerous, normally in the direction of the grain. Often break through to wood surface.
Bore dust Fine, gritty.
Likely miss-identifications Common furniture beetle