Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension
www.extension.umn.edu
612-624-1222

Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Viburnum > Holes or pits in stems or twigs

Print Icon Email Icon Share Icon

Viburnum > Stems/branches > Holes or pits in stems or twigs

1 of 2
  • Image: Fire Blight 1
  • Image: Fire Blight 2
  • Image: Fire Blight 3

Viburnum clearwing borer
Synanthedon viburni

  • Plants may be wilted
  • Stems may dieback or have sparse foliage with a few leaves at tip
  • Lower part of stems are gnarled and scarred with sawdust
  • Pupal cases may be found sticking out of holes in bark in spring
  • Entire bush may die
  • Adult borers have ½ inch bluish black bodies with yellow markings and a ¾ inch wingspan – wings are clear
  • More information on Viburnum clearwing borer
2 of 2
  • Image: Fire Blight 1
  • Image: Fire Blight 2
  • Image: Fire Blight 3

Viburnum leaf beetle
Pyrrhalta viburni

  • Larvae feed in groups
  • Larvae skeletonize leaves in spring
  • Heavily chewed leaves in summer by larvae and adults
  • Terminal twigs with egg masses arranged in straight rows in late summer through winter
  • Adult beetles are about ¼ inch long, brownish in color with thick golden-gray pubescence on wing covers
  • Larvae are less than ½ inch long when mature
  • Has been recently found in Minnesota. If you believe you have found viburnum leaf beetle, contact the Minnesota Department of Agriculture via Arrest the Pest.
  • More information on Viburnum leaf beetle

Don't see what you're looking for?