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Viburnum > Stems/branches > Rough, bumpy, or cracked areas on bark

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  • Image: Sunscald 1
    Credit: W. Seidel, University of Minnesota
  • Image: Sunscald 2

    Credit: W. Seidel, University of Minnesota

  • Image: 3

    Credit: W. Seidel, University of Minnesota

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green arrowOystershell 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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