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Chokeberry > Leaves > Leaves discolored white, yellow, or pale green

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  • Image: 1
    Credit: John Hartman, University of Kentucky, Bugwood.org
  • Image: 2

    Credit: Whitney Cranshaw, Colorado State University, Bugwood.org

  • Image: 2

    Credit: Whitney Cranshaw, Colorado State University, Bugwood.org

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green arrowPowdery 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
  • Red or purple blotches may occur on upper leaf surfaces
  • More information on powdery mildew...
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  • Image: 1
    Credit: Chazz Hesselein, Bugwood.org
  • Image: 2

    Credit: M.Grabowski, UMN Extension

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green arrowNon-selective herbicide injury
(Round-up, Kleen-up, and other glyphosate products)

  • Yellowing, wilting, browning leaves and eventual death of foliage and plants
  • Damage usually appears first in new tissues
  • Shrubs sprayed during the summer or fall may not have noticeable injury until the following season when leaves appear as stunted, narrow, strap-like, and chlorotic
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  • Image: 1
    Credit: Randy Nelson, University of Minnesota
  • Image: 2

    Credit: Randy Nelson, University of Minnesota

  • Image: 2

    Credit: Randy Nelson, University of Minnesota

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green arrowPlant growth regulator herbicide injury
(2,4-D, Dicamba, etc.)

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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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