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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Viburnum > Dead or dying branches

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Viburnum > Stems/branches > Dead or dying branches

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  • Image: Fire Blight 1
  • Image: Fire Blight 2
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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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  • Image: Black Rot 1
  • Image: Black Rot 2
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Botryosphaeria canker
Botryosphaeria dothidea

  • Leaves on one or more branches wilt, die and turn brown
  • Cankers are sunken, dark colored areas on branches
  • Fungal fruiting bodies give canker area a rough or pimpled appearance
  • Infected young shoots turn dark brown and curl over in a shepherd's crook
  • More information on Botryosphaeria canker
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  • Image: White Rot 1
  • Image: White Rot 2

Verticillium wilt
Verticillium dahliae

  • Leaves on one to several branches turn red to yellow, wilt, die and fall off
  • Depending on the stage of infection, dark streaks are often visible in sapwood if the bark is peeled back
  • Symptoms may develop over a single growing season or over several years
  • More information on Verticillium wilt
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  • Image: Winter Injury 1
  • Image: Winter Injury 2
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Armillaria Root Rot
Armillaria spp.

  • Leaves may be small, pale green to yellow with dark green veins
  • When severe, leaf edges turn brown leaves wilt and the branch dies
  • No symptoms on branches
  • Flat white sheets of fungal mycelia can be seen under the bark on roots or at the base of the plant
  • Clusters of honey-colored mushrooms may grow at the base of the shrub in the fall
  • More information on Armillaria root rot
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  • Image: Sunscald 1
  • Image: Sunscald 2
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Oystershell scale
Lepidosaphes ulmi

  • Light infestations do not exhibit obvious symptoms
  • Severe infestations can cause chlorotic, stunted foliage
  • Dieback and cracked bark can result from heavy infestations
  • Light to dark brown, elongated, 1/10 to 1/8 inch long oyster-shell shaped scales found on bark.
  • More information on Oystershell Scale

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