Rhagium sycophanta
Ribbed borer
About 17–30 mm long beetle with short antennae and two distinct thorn-like outgrowths on the thorax. It is greyish-brown with paler spots on elytra. The female is larger than the male. It flies from May until August in broadleaved forests. Larvae excavate galleries under the bark of oak stumps and fallen trunks. It usually attacks injured or dead trees.
Galleries under bark. Elliptical exit holes.
Tree Species: Oak
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, Up to 2 cm depth, Up to 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
Callidium violaceum
Plagionotus arcuatus
