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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Ironwood (Ostrya) > Holes in trunk

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Ironwood (Ostrya) > Trunk/branches > Holes in trunk

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  • Image: Black Rot 1
  • Image: Black Rot 2
  • Image: Black Rot 3

Twolined chestnut borer
Agrilus bilineatus

  • Leaves in upper canopy turn brown and dead branches are present
  • Damage visible mid to late summer
  • S-shaped galleries beneath bark
  • 1/8 inch D-shaped exit holes may be visible
  • Adult has bluish black body with two light stripes running down the wing covers
  • Larvae are approx. 1 inch long and white with 2 spines at the abdomen tip
  • More information on Twolined chestnut borer

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