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Tremex fuscicornis

Tremex woodwasp

Description

Tremex woodwasp Tremex fuscicornis is a wood wasp species found from Europe to Japan, belonging to the Siricidae family. This species targets a variety of broadleaf trees, including Fagus, Populus, Ulmus, Alnus, Quercus, Acer, and Prunus. It prefers Betula spp. The adult wasps typically mate in the upper branches of trees. Females select stressed or damaged trees for oviposition, laying 300-400 eggs. The eggs are deposited at an angle, spaced apart yet grouped within the wood. After hatching, the larvae initially feed on a symbiotic fungus's hyphae before creating longitudinal, semi-circular galleries up to 1 meter long. These galleries increase in diameter as the larvae grow. Pupation occurs at about 4 cm depth within the wood. The larvae take 1-3 years to develop fully, with adults typically emerging in late summer or fall.

Symptom

Regular round holes in the trunk, gouges in the wood.

Tree Species: Elm, Birch, Oak, Maple, Alder, Lime

Part of a plant- attacked: Tree trunk, Branch

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes

Last observations

There are a total of 1 observations of the species in the system

Tremex fuscicornisTremex woodwasp
Botto
Number of votes: 0
Published: 15.8.2025