Pest Guides

Bark Borer

Ernobius mollis


Bark Borer

  • The adult Bark Borer is 3–6mm in length and is red or chestnut brown with yellow silky hairs on its’ body.


  • The female Bark Borer lays 20-30 eggs in bark crevices which hatch into larvae in two to three weeks.
  • Pupation follows in spring or early summer, lasting one or two weeks.
  • Adult Bark Borers emerge between May and August.


  • Damage is confined to unbarked softwoods, causing no structural damage. Damage caused by these species of wood borer insects occur on pergolas, rustic work, fence posts and garden sheds.