Pest Guides

Bark Borer

Ernobius mollis


Image of Bark Borer [Ernobius mollis] | Ehrlich Pest Control
  • Adult – 1/8"–1/4". Red or chestnut brown with yellow silky hairs on body.


  • Female 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.
  • Adults emerge between May and August.


  • Damage confined to unbarked softwoods, causing no structural damage. Occurs on pergolas, rustic work, fence posts and garden sheds.

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