European shothole borer (Xyleborus dispar Fabricius)
Pest description and damage Shothole borers are small bark beetles that often attack weakened branches. Xyleborus dispar is the primary shothole borer infesting chestnut in the PNW. When the numerous beetles emerge, the bark looks like it had been hit by buckshot. These beetles are primarily a problem on injured or stressed plants, but healthy trees growing adjacent to blocks of neglected trees also may be attacked. The adult shothole borer is a brownish-black beetle about 0.08 inch long. The larvae are white, legless, and about 0.16 inch long.
For biology, life history, monitoring and management
See "Bark beetle" in:
For more information
Rosetta, R. 2012. European shot-hole borer (http://oregonstate.edu/dept/nurspest/xyleborus_dispar.htm)