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