PestHigh Severity

Engraver Beetles (Pine Bark Beetles)

Ips spp.

Small bark beetles that create characteristic curved, S-shaped, or Y-shaped galleries under the bark of conifers. They primarily attack weakened or stressed trees and can cause rapid tree mortality through their tunneling activities.

Peak Season: Multiple generations from spring through fall. Peak activity during warm summer months. Overwinters in bark of host trees.
Engraver beetles showing characteristic boring damage patterns and gallery formation typical of bark beetles

Identification & Symptoms

What to Look For

Dieback on upper terminals and lateral branches
Curved, S-shaped, or inverted-Y tunnels under bark
Tortuous or straight and parallel galleries
Fine reddish-brown boring dust at base of tree
Pitch tubes on bark surface (in some species)
Yellowing and browning of needles
Premature needle drop

Potential Damage

Girdling of branches and main trunk through gallery construction
Disruption of nutrient and water transport
Secondary fungal infections introduced by beetles
Rapid tree decline and mortality
Reduced timber value
Increased fire hazard from dead trees

Lifecycle

Usually 1-3 summer generations and 1 overwintering generation. Overwinter as adults, larvae, or pupae beneath bark of trees killed the previous season. Larvae are very small (3/16 inch when mature) and white. Adults are 1/10-3/8 inch long, red-brown to black, shiny with parallel sides and 3-6 spines at wing ends. Development rapidity varies with seasons and localities.

Professional Treatment Approach

1

Apply Imisol as preventive treatment to high-value trees

2

Use Imicide for direct treatment of infested trees

3

Remove and destroy infested trees promptly to prevent spread

4

Maintain tree health with Arborfos to reduce susceptibility

5

Avoid tree stress through proper watering and nutrition

6

Monitor trees regularly during drought or stress periods

Recommended Mauget Products

Imisol

Professional-grade treatment specifically effective against engraver beetles (pine bark beetles).

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Imicide

Professional-grade treatment specifically effective against engraver beetles (pine bark beetles).

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Arborfos

Professional-grade treatment specifically effective against engraver beetles (pine bark beetles).

View Product Details

Need Professional Diagnosis?

Our certified arborists can help you accurately identify tree problems and develop an effective treatment plan using Mauget's proven injection systems.