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Prionus coriarius

Tanner Beetle

Description

The tanner beetle Prionus coriarius is a beetle from the family Cerambycidae within the order Coleoptera. It is known for its impressive size, reaching lengths of 18–45 millimeters, making it one of the most massive beetles in Europe. Females are larger than males. The body of P. coriarius is shiny and dark brown to black.This beetle is polyphagous and typically develops in dead and decayed wood of both deciduous and coniferous trees. The larvae feed on rotten wood, contributing to its decomposition, rather than attacking live trees. The life cycle of Prionus coriarius lasts at least 3 years. Adults are most commonly observed from July to September.

Although P. coriarius is not generally a pest of healthy trees, it is often misidentified as potentially harmful species such as Cerambyx scopolii, Cerambyx cerdo, Rhagium spp., Aegosoma scabricorne, or some Monochamus species, which can pose a threat to tree health.

Symptom

Galleries in the wood.

Tree Species: Different tree species

Part of a plant- attacked: Tree trunk

Pest significance: Not harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes

Last observations

There are a total of 6 observations of the species in the system

Prionus coriariusTanner Beetle
Martin Minár
Number of votes: 0
Published: 7.8.2025

Prionus coriariusTanner Beetle
Pavol Poláčik
Number of votes: 0
Published: 19.7.2025

Prionus coriariusTanner Beetle
Pavol Poláčik
Number of votes: 0
Published: 19.7.2025

Prionus coriariusTanner Beetle
Michal Vlček
Number of votes: 0
Published: 31.7.2024

Prionus coriariusTanner Beetle
Michal Bugala
Number of votes: 0
Published: 10.8.2023