Hylesinus varius (=fraxini)
Ash bark beetle
Description
The ash bark beetle is the most common ash bark pest in Europe. It usually colonizes trunks of medium-aged or young trees. In case of broad-stemmed and older ash trees the beetle lives on thick branches. Its size is 2.5–3.5 mm. The gallery system consists of pairs of 6–10 cm long maternal tunnels. The larval tunnels, 3–6 cm long, are dense and parallel. The larvae push a high amount of wood debris in the form of a whitish powder out of the holes in wood. The larvae usually pupate in sapwood. The adult beetles leave the galleries through exit holes. The adults construct overwintering gallery under the bark. Characteristic galls develop over this place.
Symptom
Galleries under the bark.
Tree Species: Ash
Part of a plant- attacked: Tree trunk
Pest significance: Harmful
Pest Category: Insects
Invasive Species: No
Present in EU: Yes
Seasonal frequency of occurrence
Seasonal frequency of occurrence
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