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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Viburnum > Leaves brown to black and wilted

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Viburnum > Leaves > Leaves brown to black and wilted

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  • Image: Black Rot 1
  • Image: Black Rot 2
  • Image: Black Rot 3

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: Winter Injury 1
  • Image: Winter Injury 2

Bacterial leaf spot (bacterial blight)
Pseudomonas syringae pv viburni

  • Dark brown to black angular blotches on leaves
  • Blotches may grow together resulting in large irregular black areas on leaves
  • Shiny bacterial ooze may be visible on leaf surface
  • Dark colored blotches may occur on young shoots
  • Severe cases may result in shoot death and branch dieback
  • More information on Bacterial leaf spot (bacterial blight)

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