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Maple > Trunk/Branches > Growths or bumps on branches or trunk

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  • Image: Cottony Maple Scale 1
    Credit: E. E. Nelson, Bugwood.org
  • Image: Cottony Maple Scale 2

    Credit: A. Steven Munson, USDA Forest Service, Bugwood.org

  • Image: Cottony Maple Scale 3

    Credit: PA Dept of Cons. and Natl Resources - Forestry Archive, Bugwood.org

  • - CLICK PHOTOS TO ENLARGE -

green arrowCottony maple scale
Pulvinaria innumerabilis

  • Nymphs are brown-translucent, 1/5 inch; females lay eggs in the white marshmallow egg-sac along the twigs and small branches
  • Young insects remove sap from leaves creating a speckled appearance and possibly yellowing leaves in mid to late summer
  • Excrete honeydew, a sticky, shiny material, on leaves and branches; sooty mold may also result from honeydew
  • Heavy infestations cause premature leaf drop and branch dieback
  • Silver maple is preferred host
  • More information on Cottony Maple Scale...
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  • Image: Phomopsis galls 1
    Credit: M. Grabowski, University Of Minnesota
  • Image: Phomopsis galls 2

    Credit: M. Grabowski, University Of Minnesota

  • Image: Phomopsis galls 3

    Credit: M. Grabowski, University Of Minnesota

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green arrowPhomopsis galls

  • Galls are round woody balls, occurring individually or clustered on twigs or branches
  • Range in size from 1/4 to 2 inches in diameter
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  • Image: Oystershell scale 1
    Credit: W. Seidel, University of Minnesota
  • Image: Oystershell scale 2

    Credit: W. Seidel, University of Minnesota

  • Image: Oystershell scale 3

    Credit: W. Seidel, University of Minnesota

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green arrowOystershell scale
Lepidosaphes ulmi

  • Heavy infestations of “shells” can completely cover bark
  • Feeding can cause foliage to yellow
  • Twig and branch dieback can occur when branches are heavily infested
  • Light to dark brown, elongated, 1/10 to 1/8 inch long, found feeding on branches
  • Damage occurs during summer
  • More information on Oystershell scale...
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  • Image: Burls 1
    Credit: M. Grabowski, University Of Minnesota
  • Image: Burls 2

    Credit: M. Grabowski, University Of Minnesota

  • Image: Burls 3

    Credit: M. Grabowski, University Of Minnesota

  • - CLICK PHOTOS TO ENLARGE -

green arrowBurls

  • Large round to semi-circular swellings along main trunk or large branches
  • Many buds or sprouts may be present on the exterior of the burl
  • Common on sugar and Norway maples
  • More information on Burls...

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