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Steely Blue Beetle

Korynetes caeruleus


  • Adult – 1/8". Shiny blue colour.


  • Eggs are laid on the surface of wood by or just inside exit holes.
  • Larvae live inside wood that has been infested by wood boring insects, where they feed on the larvae of these wood-damaging insects.
  • Adult: After emergence they mate, lay eggs and then die.


  • Predator of common furniture beetle and death watch beetle – so its presence indicates a heavy infestation of either wood-boring insect.
  • It is the rarely seen larvae which consumes the larvae of the wood-boring pests in their tunnels. The steely blue beetle is not capable of damaging wood.

Treating woodworm in commercial buildings