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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Hackberry > Flecks, spots or blotches on leaves

Hackberry > Leaves > Flecks, spots or blotches on leaves

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  • Image: Hackberry island chlorosis 1
    Credit: M. Grabowski, University Of Minnesota
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green arrowHackberry island chlorosis
Hackberry island chlorosis virus

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  • Image: Hackberry lacebug 1
    Credit: M. A. Hansen, VA Poly. Institute & State Univ., Bugwood.org
  • Image: Hackberry lacebug 2

    Credit: F. & K. Starr, U.S. Geological Survey, Bugwood.org

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green arrowHackberry lacebug
Corythucha celtidis

  • White or yellow speckled or pinprick discolorations on upper
    leaf surfaces
  • Lace bugs are up to 1/4 inch long; light colored bodies with dark colored spots; intricate, lacy wings
  • More information on Hackberry lacebug...
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  • Image: Hackberry nipple gall 1
    Credit: W. Cranshaw, CO State University, Bugwood.org
  • Image: Hackberry nipple gall 2

    Credit: J. Hahn, University Of Minnesota

  • Image: Hackberry nipple gall 3

    Credit: S. Katovich, USDA Forest Service, Bugwood.org

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green arrowHackberry nipple gall
Pachypsylla celtidismamma

  • Yellow discolorations on upper leaf surface above the nipple galls
  • Circular, nipple-like swellings that project from the undersides
    of leaves
  • Premature leaf drop can occur during heavy infestations
  • Adults are light brown with flecks of creamish-white and look like miniature cicadas; 1/8th to 3/16th long
  • More information on Hackberry nipple gall...
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  • Image: Cottony maple scale 1
    Credit: PA Dept. of Cons. & Nat'l Resources - Forestry Archive, Bugwood.org
  • Image: Cottony maple scale 2

    Credit: E. E. Nelson, Bugwood.org

  • Image: Cottony maple scale 3

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

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green arrowCottony maple scale
Pulvinaria innumerabilis

  • Young insects remove sap from leaves creating a speckled appearance and possibly yellowing leaves in mid to late summer
  • White marshmallow egg-sacs along the twigs and small branches
  • Honeydew, a sticky, shiny material, on leaves and branches
  • Sooty mold may result from honeydew
  • Heavy infestations cause premature leaf drop and branch dieback
  • Nymphs are brown-translucent, 1/5 inch long
  • More information on Cottony maple scale...
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  • Image: Downy mildew 1
    Credit: M. Grabowski, University Of Minnesota
  • Image: Downy mildew 2

    Credit: M. Grabowski, University Of Minnesota

  • Image: Downy mildew 3

    Credit: M. Grabowski, University Of Minnesota

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green arrowDowny mildew
Pseudoperonospora celtidis

  • Light green to yellow spots or blotches on leaves; spots turn brown with age
  • Infected leaves may be puckered or distorted around spots
  • White to gray fluffy mats form on leaf undersides in humid conditions
  • More information on Downy mildew...

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