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How to identify it
- Look for yellow, orange or reddish-brown boring dust in the bark crevices and at the base of the tree, and for small shot-hole exit holes in the bark.[2][3]
- Under the bark, the beetles leave branching tunnels etched into the inner bark where they lay eggs and the larvae feed.[2][5]
- Needles on infested pines turn yellow to red within a few weeks to months, often starting with dieback at the top of the tree.[3][2]
- The adult beetles are small, about 3 to 5 mm long.[4]
Look-alikes
| Look-alike | How to tell them apart |
|---|---|
| Mountain pine beetle and other Dendroctonus bark beetles | Ips beetles are generally less destructive and aggressive than Dendroctonus bark beetles such as the mountain pine beetle, and they often attack the tops of trees rather than the main trunk.[5][4] |
Where it lives
Found coast to coast in North America and a major pine pest from Wisconsin to Colorado, Utah and Oregon.[4][1][5][3]
Biology and life cycle
Adults overwinter under the bark, and in Oregon pine-infesting Ips begin their attack flights in April; the larvae feed in galleries around the egg-laying areas.[2][4]
A generation takes about 6 to 8 weeks, so there can be three or four generations a year.[3][2]
Populations build in fresh green material more than about 3/4 inch thick left from pruning, thinning or land clearing, then can attack and kill nearby standing pines, especially in drought.[3][4][1]
Damage and signs
Health risk
It attacks trees only; none of the sources reports any harm to people or pets.[2][3]
Control
Prevention
Keep pines vigorous: water them during drought and avoid root injury and soil compaction, since stressed and newly planted trees are the ones attacked.[5][3]
Sanitation
Don't leave fresh pine slash or firewood near live pines through spring and summer, do pine cutting in fall and winter where you can, and remove pines that die suddenly before new beetles emerge; pines dead long enough for the bark to loosen no longer support the beetles.[1][4][3]
Pesticides
Once the beetles are established, the tree usually can't be saved; preventive trunk sprays on valuable uninfested pines protect them, for about 18 months according to Utah's forestry division.[2][3]
Common questions
- Why is the top of my pine turning red?
- A pine whose top turns yellow to red within weeks, with reddish boring dust in the bark crevices, may be under attack by pine engravers.[3][2]
- Can I save a pine with engraver beetles?
- Usually not once the beetles are established, but removing infested trees and fresh slash protects nearby pines, and preventive sprays can protect valuable uninfested trees.[2][3][1]
Sources
- Wisconsin DNR Forest Health Protection (hosted by UW Forestry Extension), “The Pine Engraver Bark Beetle (Ips pini) in Northern Wisconsin (FHP-2).” forestry.extension.wisc.edu/files/2017/09/FHP-2.pdf (accessed 2026-10-17)
- Montana State University Extension (Urban IPM), “Engraver Beetles (Ips spp.).” urbanipm.montana.edu/entomology/resources/fact-sheets/engraver-beetles.html (accessed 2026-10-17)
- Utah Division of Forestry, Fire and State Lands, “Ips Engraver Beetle (Forest Insect & Disease Leaflet, C. Keyes).” web.archive.org/web/20221008040902/www.ffsl.utah.gov/wp-content/uploads/IpsengraverBeetle.pdf (accessed 2026-10-17). Archived copy (Internet Archive, captured 2022-10-08); the original page https://ffsl.utah.gov/wp-content/uploads/IpsengraverBeetle.pdf returns 404 (file removed).
- Oregon Department of Forestry, “Ips beetles (Forest Health Fact Sheet).” oregon.gov/odf/documents/forestbenefits/ips.pdf (accessed 2026-10-17)
- Colorado State University Extension, “Ips Beetles (Fact Sheet 5.558, W. Cranshaw; copy hosted by Utah State University).” extension.usu.edu/pests/uppdl/files/factsheet/05558.pdf (accessed 2026-10-17)
- iNaturalist, “Ips pini taxon page (order and family).” www.inaturalist.org/taxa/222278 (accessed 2026-10-06)