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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Honeylocust > Holes in bark

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Honeylocust > Branches > Holes in bark

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  • Image: Honeylocust borer 1
  • Image: Honeylocust borer 2

Honeylocust borer
Agrilus difficilis

  • “D” shaped exit holes found in declining branches
  • Branches larger than ½ inch diameter die back from larvae feeding under bark
  • Removal of bark reveals frass filled galleries
  • Wet spots due to sap-stains on bark around infestation sites
  • Adults are 5/16- ½ inch long, bullet-shaped with characteristic whitish to yellowish bands on abdomen
  • Adults make notches along leaf margins while feeding

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