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Monochamus sartor

Long-horned beetle

Description

The beetle is 19-35 mm long. Its life cycle takes 1-2 years, with the adult stage occurring from July till August. The male is grey-black and its antennae are twice the female antennae length. The pronotum and elytra of females have a few white spots, but these are absent or indistinct on males. The females lay eggs into holes chewed in the bark of declining or recently felled trees. First, the larvae feed under the bark, later at the end of the year they mine deeper in the sapwood to pupate. Pupation chambers are plugged with wooden fibres and occur at a depth of 10 to 12 mm. The galleries between phloem and wood are filled with coarse wood residue. Adults emerge from round exit holes 8 to 12 mm in diameter.  The pest occurs more frequent in mountain areas. Large diameter stems are preferred. As populations increase during an outbreak, attacks can occur on healthy trees. Its relative M. sutor is a spruce pest too.

Symptom

The galleries between phloem and wood are filled with coarse wood residue.

Tree Species: Pine, Fir, Spruce

Part of a plant- attacked: Tree trunk

Pest significance: Very harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes

Last observations

There are a total of 15 observations of the species in the system

Monochamus sartor Long-horned beetle
Anonymous contributor
Number of votes: 0
Published: 30.8.2025

Monochamus sartor Long-horned beetle
Štefan Mitaľ
Number of votes: 0
Published: 21.8.2025

Monochamus sartor Long-horned beetle
Anonymous contributor
Number of votes: 0
Published: 27.7.2025

Monochamus sartor Long-horned beetle
#mirec_paz
Number of votes: 0
Published: 25.6.2024

Monochamus sartor Long-horned beetle
majo
Number of votes: 0
Published: 24.6.2024