Longhorn Beetle

The antennae

The defining feature of longhorn beetles (Cerambycidae) is their antennae, which are often longer — sometimes far longer — than their body. In some tropical species, the antennae can be three times the body length. The antennae detect chemical signals for finding mates, suitable trees for egg-laying, and food sources. In males, longer antennae are associated with better mate-finding success in some species.

Wood borers

Longhorn beetle larvae are wood-borers — they hatch from eggs laid on or in tree bark and spend from 1 to more than 10 years boring through wood, eating it as they go. They create tunnels (galleries) that can seriously damage the structural integrity of living trees. The larval tunnels are often visible as D-shaped or oval exit holes in the bark when the adult emerges.

The Asian longhorn beetle

Anoplophora glabripennis (Asian longhorn beetle) is one of the world’s most damaging invasive tree pests, spreading from China and Korea to North America and Europe in wooden packing materials. It attacks a wide range of deciduous trees — maple, elm, birch, willow, poplar — boring into healthy trees and killing them over several years. Once established in an area, eradication requires destroying all potentially infested trees.

Ancient woodland specialists

In contrast to invasive species, many native European longhorn beetles are important decomposers and biodiversity indicators in old-growth forests. Species like Ergates faber (tanner beetle) and Cerambyx cerdo (great capricorn beetle) require very old, hollow, or dead trees and are rare indicators of ancient woodland. Their larval galleries create habitat for other hole-nesting species.