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Sumac > Stems/branches > Dead branches or branch or shoot dieback

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

    Credit: Jeffrey Hahn, University of Minnesota

  • Image: 2

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

    Credit: M. Grabowski, University of Minnesota

  • Image: 2

    Credit: M. Grabowski, University of Minnesota

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green arrowVerticillium wilt
Verticillium dahliae

  • Leaves on one to several branches turn red to yellow, wilt, die and fall off
  • Dark olive to gray streaks are often visible in the sapwood if the bark is peeled back
  • Symptoms often seen in one to a few branches but may spread to the entire canopy
  • Symptoms are often most obvious in late summer and autumn but can occur throughout the growing season
  • More information on verticillium wilt...
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  • Image: 1
    Credit: Fred Brooks, University of Hawaii at Manoa, Bugwood.org
  • Image: 2

    Credit: University of Georgia Plant Pathology Archive, Bugwood.org

  • Image: 2

    Credit: T. D. Leininger, USDA Forest Service, Bugwood.org

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green arrowBotryosphaeria canker
Botryoshaeria spp.

  • Leaves on one or more branches wilt, die and turn brown
  • Cankers are sunken, dark colored areas on branches
  • Fungal fruiting bodies give canker area a rough or pimpled appearance
  • Infected young shoots turn dark brown and curl over in a shepherd's crook
  • More information on Botryosphaeria canker...

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