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