Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Hydrangea > Rough or bumpy areas on bark
Hydrangea > Stem/Branches > Rough or bumpy areas on bark
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Oystershell scale
Lepidosaphes ulmi
- Light to moderate infestations show little or no 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
