Rhagium mordax
Black-spotted longhorn beetle
About 13–22 mm long beetle. Adults overwinter, they can be seen from April to August. Females oviposit on trunks of dying or dead trees. The larva develops under the bark and later pupates there. It can be abundant, but does not cause primary damage. It prefers hilly and mountainous regions in Central Europe.
Relatively large galleries under the bark, elliptical excavation holes.
Tree Species: Birch, Beech, Oak, Fir, Spruce
Part of a plant- attacked: Tree trunk
Pest significance: Less harmful
Pest Category: Insects
Invasive Species: No
Present in EU: Yes
Pest group: Insect
Depth of damages: Bark, Under bark only, Up to 0,5 cm depth
The extent of damage: Whole trunk
Prevalence in Europe: Common
Damaged products: Firewood, Fresh timber logs (water still in the sapwood)
Roundwood size: Diameter 50+, Diameter from 10 up to 50 cm, Diameter up to 10 cm
Wood discoloration: No
Exit holes: Oval
Pest subcategory: Wood-boring insect
Similar pests
Cerambyx cerdo
Rhagium sycophanta
