Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension

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

Print Icon Email Icon Share Icon

Crab Apple > Trunk > Hole in trunk

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

Dogwood Borer
Synanthedon scitula

  • Larvae feed in young trees often around lawn mower injuries, and in pruning scars of older trees
  • Feeding causes girdling and reduced sap flow
  • Brownish-red frass (excrement) is usually present at the feeding site
  • 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

Don't see what you're looking for?