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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Viburnum > Leaves discolored yellow to pale green

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Viburnum > Leaves > Leaves discolored yellow to pale green

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  • Image: Powdery Mildew 1
  • Image: Powdery Mildew 2
  • Image: Powdery Mildew 3

Two-spotted spider mite
Tetranychus urticae

  • White to yellow stippling on foliage
  • Heavy infestations will causer leaves to turn white, yellow and ultimately grayish bronze
  • Premature leaf drop may occur
  • Shake leaves over white paper or plate to detect mites- adults are dark and move slowly
  • More information on Two-spotted spider mite...
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  • Image: Black Rot 1
  • Image: Black Rot 2
  • Image: Black Rot 3

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: 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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