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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Fruit > Apple > Spots on leaves

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Apples > Leaves > Spots 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
  • Leaf spots become dark brown to black with age
  • Brown raised corky spots on fruit
  • Severely infected fruit may be deformed and cracked
  • More information on Apple Scab
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  • Image: Cedar-Apple Rust 1
  • Image: Cedar-Apple Rust 2
  • Image: Cedar-Apple Rust 3

Cedar-Apple Rust
Gymnosporangium juniperi-virginiana

  • Leaves develop yellow, then bright orange spots with a red border
  • Small raised black dots may be present on the upper side of leaf spots, fringed tubes may be seen on the underside of the leaf spots
  • Rough green to brown irregular spots on fruit, do not extend deep into the fruit
  • Juniper bushes have brown 1/4 – 1 inch round woody galls, that produce bright orange tentacles in wet spring weather
  • More information on Cedar-Apple Rust
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  • Image: Black Rot 1
  • Image: Black Rot 2
  • Image: Black Rot 3

Black Rot
Botryosphaeria obtusa

  • Round leaf spots with a purple border and tan center
  • Large brown spots with brown rings form on fruit
  • Fruit is rotted but remains firm
  • Fruit may become mummified and remain on tree
  • Branch cankers can be sunken, reddish brown or rough looking or cracked bark; cankers may remain small or enlarge to become several feet long
  • Leaves on girdled branches wilt, die and turn brown
  • Common on stressed trees and trees infected with fire blight
  • More information on Black Rot
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  • Image: Powdery Mildew 1
  • Image: Powdery Mildew 2
  • Image: Powdery Mildew 3

Powdery Mildew
Podosphaera leucotricha

  • Part or all of infected leaves are covered in white-gray, felt-like patches
  • Infected leaves will curl, twist, or fold upward
  • Infected blossoms are distorted, discolored, and covered in white powdery fungal growth
  • Infected fruit have bronze, corky streaks, that are skin deep
  • More information on Powdery Mildew

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