PestMedium Severity

Cedar Bark Beetles

Phleosinus species

Small bark beetles that attack weakened or stressed cedar and related coniferous trees. Adults are red-brown to black, shiny beetles ranging from 1/8 to 3/8 inch long. They create characteristic short, longitudinal egg galleries with little branching that become confused under heavy infestations.

Peak Season: Adult emergence: SpringPeak attack period: Spring and summerEgg laying: Late spring through summerLarval development: Summer1.5 generations per year
Cedar bark beetle damage

Identification & Symptoms

What to Look For

Twigs yellowing, browning, and wilting at tips
Hanging dead twig tips
Small droplets of pitch below feeding areas on twigs and stems
Egg and larval galleries immediately under bark
Small entrance holes in bark

Potential Damage

Twig mortality from adult feeding and gallery construction
Progressive branch dieback
Tree mortality in severe infestations
Structural weakening of affected branches
Secondary invasion following initial stress

Lifecycle

Adults attack weak, dying, or dead trees in spring and summer. Working in pairs, they construct short longitudinal egg galleries. Eggs are uniformly spaced along gallery sides. Larvae feed laterally from the main gallery. 1.5 generations per year.

Professional Treatment Approach

1

Imisol treatments for trees under stress or showing early attack signs

2

Address underlying stress factors: drought, nutritional deficiencies, poor sites

3

Imicide applications during adult flight periods in spring

4

Arborfos treatments to improve tree vigor and resistance

5

Remove and destroy heavily infested dead material

Recommended Mauget Products

Imisol

Professional-grade treatment specifically effective against cedar bark beetles.

View Product Details

Imicide

Professional-grade treatment specifically effective against cedar bark beetles.

View Product Details

Arborfos

Professional-grade treatment specifically effective against cedar 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.