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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Mountain Ash > Spots or blotches on leaves

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Mountain Ash > Leaves > Spots or blotches on leaves

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  • Image: Apple scab 1
  • Image: Apple scab 2
  • Image: Apple scab 3

Apple scab
Venturia inaequalis

  • Olive green to brown leaf spots with an irregular or feathered edge, eventually becoming a dark brown to black
  • Infected leaves turn yellow and drop prematurely
  • More information on Apple scab

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