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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Fruit > Apple > Hole in trunk

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Apples > Trunk > Hole in trunk

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  • Image: Dogwood Borer 1
  • Image: Dogwood Borer 2
  • Image: Dogwood Borer 3

Dogwood Borer
Synanthedon scitula

  • Larvae feed in burr knot at or below the graft union, causing girdling and reduced sap flow
  • Brownish-red frass (excrement) is usually present at the feeding site
  • Damage is more common on dwarf trees
  • Adult is a black and yellow clear-wing moth, larvae are ½" long when mature, and white with a red-brown head
  • Adult emergence begins in mid-June, peaks in early July, and continues until August
  • More information on Dogwood Borer

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