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Rhagium inquisitor

Ribbed pine borer

Description

The beetle is 12–20 mm long, with short antennae with typical “Rhagium” shape. The elytra are brown with a variable drawing of paler spots. Adult beetles fly from April until August. The females lay eggs onto tree stumps or dead trunks. The larvae live under the bark, usually for two years. In autumn under the bark they create a typical pupal cradle hemmed by a layer of fine woodchips where they pupate. The beetles usually hatch in autumn; they overwinter in the cradle and swarm in spring. Some beetles leave the cradle in autumn. It is common in coniferous forests.

Symptom

The larva excavates under the bark wavy galleries, in some places up to 2 cm wide. When larvae develop under a thin bark, they pupae in wood, but usually develop under a thicker bark, where they form a very typical circular to elliptical cocoon cradle. Excavation holes are oval.

Tree Species: Pine, Fir, Spruce

Part of a plant- attacked: Tree trunk

Pest significance: Harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes

Last observations

There are a total of 12 observations of the species in the system

Rhagium inquisitorRibbed pine borer
Matej Eloga
Number of votes: 0
Published: 2.1.2026

Rhagium inquisitorRibbed pine borer
Peter Jacko
Number of votes: 0
Published: 21.12.2024

Rhagium inquisitorRibbed pine borer
Jozef Palla
Number of votes: 0
Published: 27.11.2024

Rhagium inquisitorRibbed pine borer
Jozef Palla
Number of votes: 0
Published: 27.11.2024

Rhagium inquisitorRibbed pine borer
Jozef Palla
Number of votes: 0
Published: 27.11.2024