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Hylecoetus dermestoides

Large timberworm

Description

The beetle is about 1 cm long with an elongated body. In May, the female lays eggs in groups of 100 onto dead or cut down trunks, or bare parts of trunks of standing trees. The larvae excavate typical galleries in wood in which develops the mycelium of the fungus Endomyces hylecoeti used as a food source for the larvae. The round exit holes can be very dense. It attacks preferentially beech, fir and oak wood, but it may develop in other trees too. The larvae push a high amount of wood debris in the form of a whitish powder out of the holes in wood. It is a dangerous technical pest which can completely devalue the cut down trunks.

Symptom

The larvae excavate typical galleries in wood in which develops the mycelium of the fungus Endomyces hylecoeti that they use as a food source for the larvae.

Tree Species: Beech, Oak, Fir

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 3 observations of the species in the system

Hylecoetus dermestoidesLarge timberworm
Santer
Number of votes: 0
Published: 28.3.2025

Hylecoetus dermestoidesLarge timberworm
Radoslav Černák
Number of votes: 0
Published: 12.4.2024

Hylecoetus dermestoidesLarge timberworm
Anna Petrová
Number of votes: 0
Published: 19.4.2023