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

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Serviceberry > Leaves > Spots or blotches on leaves

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  • Image: Apple Scab 1
  • Image: Apple Scab 2
  • Image: Apple Scab 3

Quince rust
Gymnosporangium clavipes

  • Fruit and stems may be swollen or distorted
  • Some yellow to orange leaf spots may be present
  • Tubular, white fungal spore producing structures protrude from fruit, giving it a spiky appearance
  • Bright orange powdery spores may be seen on and around infected leaves and fruit
  • More information on Quince rust...
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  • Image: Apple Curculio 1
  • Image: Apple Curculio 2
  • Image: Apple Curculio 3

Pear sawfly
Caliroa cerasi

  • Larvae feed on upper leaf surface leaving the veins
  • Damaged areas turn brown
  • Tree can have a scorched appearance when populations are high; leaves can drop prematurely
  • Larvae grow to ½" long, slug-like, slimy, shiny and olive green
  • More information on Pear slug sawfly...
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  • Image: Obliquebanded Leafroller 1
  • Image: Obliquebanded Leafroller 2

Juniper broom rust
Gymnosporangium nidus-avis

  • Leaf spots start as small yellow to orange spots with a red border and grow into large brown blotches with red margins
  • Swollen yellow spots on leaf veins, petioles and green twigs
  • Young shoots and leaves can turn completely brown due to a girdling infection on twig or petiole
  • White tube-shaped spore producing structures form on infected twigs, petioles and the lower surface of leaf spots in July
  • More information on Juniper broom rust...
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  • Image: Redbanded Leafroller 1
  • Image: Redbanded Leafroller 2
  • Image: Redbanded Leafroller 3

Powdery mildew
Phyllactinia guttata

  • White-gray, felt-like spots or patches on leaves
  • Infected leaves may curl, twist or fold upwards
  • Infected blossoms are distorted, discolored and covered in white powdery fungal growth
  • Lower shaded leaves and small understory trees are most commonly affected
  • More information on Powdery mildew...

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