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

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Magnolia > Leaves > Spots on leaves

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  • Image: Winter Injury 1
  • Image: Winter Injury 2
  • Image: 3

Powdery mildew
Phyllactinia guttata

  • White-gray, felt-like spots or patches on leaves
  • Infected leaves may curl, twist or fold upwards
  • Lower shaded leaves and small understory trees are most commonly affected
  • More information on Powdery mildew
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  • Image: Black Rot 1
  • Image: Black Rot 2
  • Image: Black Rot 3

Sooty mold

  • Black, brown or gray soot-like covering on leaf surfaces, twigs or branches
  • Sticky, shiny secretions on leaves from sap-sucking insects (scale insects, aphids, leaf hoppers, psyllids, etc.)
  • Insects or signs of insect damage (distorted, pin-prick feeding marks, etc.) may be seen on leaves or twigs above the worst affected moldy areas.
  • More information on Sooty mold
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  • Image: Fire Blight 1
  • Image: Fire Blight 2
  • Image: Fire Blight 3

Botrytis blight
Botrytis cinerea

  • Irregular shaped, brown, water soaked spots on flower petals
  • Round, brown leaf spots, dark brown concentric rings can often be seen within leaf spots
  • Fuzzy brown to gray mold on old spots and dead plant tissues
  • More information on Botrytis blight

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