Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Cotoneaster > Rough or bumpy areas on bark
Cotoneaster > Stems/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
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Nectria canker
Nectria cinnabarina
- Dead branches and twigs, often first observed in early spring
- Bark at the base of dead branches is slightly sunken, discolored or cracked
- Tiny, pink, pale orange or cream colored cushion-like spore-producing bodies are visible in cracks in bark in spring
- In summer, smaller coral colored bumps push through cracks
- In autumn these spore-producing structures are dark brown or black
- More information on Nectria canker
