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Mesosa nebulosa

Longhorn beetle Mesosa nebulosa

Description

Mesosa nebulosa is a species of longhorn beetle in the family Cerambycidae, measuring 9–15 mm in length. It has a distinctive black body with brownish-yellow patterns and light transverse bands on the elytra. This species inhabits deciduous trees, including oaks (Quercus), hazels (Corylus), and walnuts (Juglans), and is distributed throughout Europe, the Caucasus, and parts of North Africa.

Larvae develop dying wood or in dead wood, especially branches still attached to trees. They create galleries under the bark and in the wood. The life cycle lasts 2–3 years, with adults emerging from April to August, peaking in May and June. Infestations are common in warmer, lowland areas and can lead to branch dieback and increased susceptibility to secondary pests or pathogens.

Symptom

Affected branches display irregular galleries under the bark, often accompanied by cracking. Exit holes are visible, and wood surfaces may appear rough and damaged.

Tree Species: Beech, Cherry, Oak, Hazel

Part of a plant- attacked: Branch

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes