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Boxwood > Stems/branches > Dead branches or branch dieback

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  • Image: 1
    Credit: K. Zuzek, University of Minnesota
  • Image: 2

    Credit: K. Zuzek, University of Minnesota

  • Image: 2

    Credit: K. Zuzek, University of Minnesota

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green arrowWinter injury

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  • Image: 1
    Credit: W. Seidel, University of Minnesota
  • Image: 2

    Credit: W. Seidel, University of Minnesota

  • Image: 2

    Credit: Jeffrey Hahn, University of Minnesota

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green arrowOystershell scale
Lepidosaphes ulmi

  • Light to moderate infestations show little or no symptoms
  • Severe infestations can cause chlorotic, stunted foliage
  • Dieback and cracked bark can result from heavy infestations
  • Light to dark brown, elongated, 1/10 to 1/8 inch long oyster-shell shaped scales found on bark
  • More information on oystershell scale...
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  • Image: 1
    Credit: Plant Disease Clinic, Virginia Tech
  • Image: 2

    Credit: Plant Disease Clinic, Virginia Tech

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green arrowBoxwood 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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