Integrated Pest Management
Pine Sawyers
Monochamus spp.
Adult whitespotted pine sawyer borer (Whitney Cranshaw, Colorado State University, Bugwood.org)
Sawyer beetle larva (Milan Zubrik, Slovakian Forest Research Institute, Bugwood.org)
Black pine sawyer wood galleries (Milan Zubrik, Slovakian Forest Research Institute, Bugwood.org)
Pest Description
- 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
IPM Recommendations
- 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.