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Mockorange > Leaves > Spots or blotches on leaves

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  • Image: 1
    Credit: William Jacobi, Colorado State University, Bugwood.org
  • Image: 2

    Credit: William Jacobi, Colorado State University, Bugwood.org

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green arrowBacterial blight
Pseudomonas syringae pv syringae

  • Brown spots with yellowish haloes on leaves
  • Spots may enlarge or grow together causing the leaves to turn black and die
  • Young shoots and stems may be black and wilted
  • Flowers and flower buds turn black and wilt
  • More information on bacterial blight...
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  • Image: 1
    Credit: Bruce Watt, University of Maine, Bugwood.org
  • Image: 2

    Credit: Petr Kapitola, State Phytosanitary Administration, Czechia, Bugwood.org

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green arrowBotrytis blight
Botrytis cinerea

  • Flower buds, petals, or entire blossoms turn tan to gray
  • Flowers become covered with fuzzy gray colored fungal spores in wet weather
  • Brown, round to irregular spots on leaves, often where petals have fallen
  • Common during cool wet weather
  • More information on Botrytis blight...
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  • Image: 1
    Credit: Whitney Cranshaw, Colorado State University, Bugwood.org
  • Image: 2

    Credit: Whitney Cranshaw, Colorado State University, Bugwood.org

  • Image: 2

    Credit: John Hartman, University of Kentucky, Bugwood.org

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green arrowPowdery mildew
Erisyphe polygoni

  • White spots or blotches on leaves
  • In severe cases leaves and young shoots may be completely covered with white powdery fungal growth
  • Leaves may be stunted, curled or puckered
  • Red or purple blotches may occur on upper leaf surfaces
  • More information on powdery mildew...

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