Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension

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

Print Icon Email Icon Share Icon

Mockorange > Leaves > Spots or blotches on leaves

1 of 3
  • Image: 1
  • Image: 2

Bacterial 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
2 of 3
  • Image: 1
  • Image: 2

Botrytis 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
3 of 3
  • Image: 1
  • Image: 2
  • Image: 2

Powdery 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

Don't see what you're looking for?