- adults: 5/8 – 1 inch; black beetles with whitish-gray markings, or not
- very long antennae, about one to three times the body length
- larvae: up to 1 inch long; white grubs without legs
Host Plants, Diet & Damage
- pine, fir, Douglas-fir, spruce
- feed on the sapwood and heartwood of recently killed trees
- trees are typically dead or near death when attacked
Biology, Life Cycle & Damaging Life Stage
- overwinter as larvae in the wood
- feed on wood until mid-summer when they pupate
- adults fly from July to September
- eggs laid in chewed niches in the bark
- one generation per year or every 2 years in northern climates
- larvae are the damaging stage
- Manage trees to improve or maintain overall health.
- Primarily attacks recently killed trees; no control is recommended to protect trees.
- Prune infested wood/branches and chip or burn.
- No pesticide treatment is recommended.