PestHigh Severity

Redwood Bark Beetles

Phleosinus spp.

Bark beetles that attack redwood, cedar, and cypress species. Adults attack all upper parts of weak, dying or dead trees, and construct egg galleries after feeding on healthy twigs and branches, girdling them until nutrient flow stops.

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Redwood bark beetle showing characteristic gallery patterns and bark damage on conifer trees

Identification & Symptoms

What to Look For

Twigs yellowing, browning, and wilting at tips
Hanging dead twigs and branches
Egg and larval galleries immediately under bark
Small droplets of pitch below feeding areas
Girdled twigs and branches
Tree mortality from heavy infestations

Potential Damage

Girdling of twigs and branches stops water and nutrient flow
Death of individual branches and twigs
Weakening of overall tree structure
Complete tree mortality in severe cases
Secondary pathogen entry through galleries

Lifecycle

Adults attack in spring and summer with 1.5 generations per year, but may attack during other times of stress. Adults work in pairs to create egg burrows with eggs uniformly spaced along sides. Larvae feed laterally from egg galleries.

Professional Treatment Approach

1

Remove and destroy infested trees and branches

2

Improve growing conditions to reduce stress

3

Preventive insecticide treatments on valuable trees

4

Proper pruning to remove weakened branches

5

Maintain tree vigor through proper care

Recommended Mauget Products

Imicide

Professional-grade treatment specifically effective against redwood bark beetles.

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Tree-äge

Professional-grade treatment specifically effective against redwood bark beetles.

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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.

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