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

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Boxwood > Leaves > Spots or blotches on leaves

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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
  • More information on powdery mildew
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Boxwood blight
Cylindrocladium buxicola (syn C. pseudonaviculatum)

  • Round leaf spots with a tan center and dark brown edge
  • White chalky looking spores on lower surface of leaf
  • Dark brown to black streaks on stems
  • Stem cankers can girdle and kill branches
  • Rapid defoliation and twig deback, roots remain healthy
  • Not currently found in MN. If suspected, call the Minnesota Department of Agriculture "Arrest the Pest" Hotline: 1-800-545-6684
  • More information on boxwood blight

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