-- This beetle occurs over much of the East and attacks maple and white
oaks and, to a lesser extent, the red oaks. It bores into the trunks
of live trees of all sizes. Damaged wood is degraded for such uses as
veneer, cooperage, and furniture.
Insect (figure 25a). -- Adults are black to reddish-brown, cylindrical
beetles about .2 inch (4 mm) long. The larvae are white, legless and
the Injury (figure 25b). -- Holes less than .1 inch (1 to 2 mm)
in diameter, are bored straight into the sapwood until the tunnel nears
the heartwood, then it turns right or left. Damage is conspicuous in
log ends. Streaks of stain originating from the tunnels are known as
-- Adult beetles construct galleries. Eggs are laid in chambers along
the main tunnel where the larvae live and develop. Larval food is a
white fungus that grows on the gallery walls. There are two to three
generations per year.
-- There is no apparent relationship between tree vigor and susceptibility.
No natural enemies have been found.