Pest Guides

Steely Blue Beetle

Korynetes caeruleus


Steely Blue Beetle

  • The adult Steely Blue beetle is 4mm in length and shiny blue colour.


  • Eggs of Steely Blue beetles are laid on the surface of wood next to, or just inside, exit holes.
  • Larvae live inside wood that has been infested by wood borer insects, where they feed on the larvae of these wood damaging insects.
  • After emergence, adults mate, lay eggs and then die.


  • The Steely Blue beetle is the predator of the common furniture beetle and death watch beetle. Its presence indicates an infestation of either wood borer insect.
  • It is the rarely seen that larvae consume the larvae of the wood borer pests in their tunnels. The Steely Blue beetle is not capable of damaging wood.