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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Lilac > Bumpy areas on bark

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Lilac > Stems/branches > Bumpy areas on bark

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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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