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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Viburnum > Spots or blotches on leaves

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Viburnum > Leaves > Spots or blotches on leaves

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  • Image: Iron Chlorosis
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Powdery mildew
Microsphaera penicillata or Erysiphe viburni

  • White, powdery fungal growth on both upper and lower surface of leaves
  • Tiny round black fungal structures can sometimes be seen within white spots
  • Leaves may turn reddish purple or pale yellow around fugal growth
  • Leaves may be twisted or deformed by infection
  • Common on lower shaded branches, or on shrubs grown in shady areas
  • More information on Powdery mildew...
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  • Image: Fire Blight 1
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Erineum gall
Eriophyid mites

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  • Image: Powdery Mildew 1
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Rust
Coleosporium viburni

  • Pale yellow to orange leaf spots
  • Spots are raised bumps on the underside of the leaf and break open to release bright orange powdery spores
  • Common on lower inner branches
  • More information on rust...
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  • Image: Black Rot 1
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Downy mildew
Plasmorpha viburni

  • Leaf spots are first yellow then brown
  • Spots may be angular or have feathery edges depending on species of viburnum
  • Fuzzy, grayish-white areas of fungal growth may be visible on underside of blotches
  • Spots may join together to form large blotches.
  • Young leaves may become crinkled or distorted
  • In severe cases, infected leaves may fall
  • More information on Downy mildew...
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  • Image: Black Rot 1
  • Image: Black Rot 2

Bacterial leaf spot (bacterial blight)
Pseudomonas syringae pv viburni

  • Leaf spots are first yellow then brown
  • Spots may be angular or have feathery edges depending on species of viburnum
  • Fuzzy, grayish-white areas of fungal growth may be visible on underside of blotches
  • Spots may join together to form large blotches.
  • Young leaves may become crinkled or distorted
  • In severe cases, infected leaves may fall
  • More information on Bacterial leaf spot...

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