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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Magnolia > Leaves discolored

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Magnolia > Leaves > Leaves discolored

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  • Image: Fire Blight 1
  • Image: Fire Blight 2
  • Image: Fire Blight 3

Iron chlorosis
Erwinia amylovora

  • Leaves yellow with green veins
  • Most severe on branch tips or new growth
  • Affected trees have poor growth, undersized leaves
  • Symptoms occur on Magnolias in alkaline soils
  • More information on Iron chlorosis
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  • Image: Black Rot 1
  • Image: Black Rot 2
  • Image: Black Rot 3

Verticillium wilt
Verticillium spp.

  • Leaves are small and yellowed in chronic infections
  • Leaves wilt, eventually turn brown and die in severe infections
  • Leaf symptoms are often seen on only one or a few random branches in the canopy
  • Dark olive to gray streaks are often visible in the sapwood if the bark is peeled back, appearing as rings or arcs in a cross section
  • Symptoms may develop over a single season, or over several years
  • More information on Verticillium wilt
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  • Image: White Rot 1
  • Image: White Rot 2
  • Image: White Rot 3

Magnolia scale
Neolecanium cornuparvum

  • Yellow leaves may die and drop prematurely
  • Dead twigs and reduced growth with heavy infestations
  • Excrete honeydew, a sticky, shiny material on leaves and branches; sooty mold may also occur on honeydew
  • Adults almost ½ inch long with whitish, waxy coating that wears off with age
  • More information on Magnolia scale

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