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Ninebark > Leaves > Curled, cupped, or distorted leaves

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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: Michelle Grabowski, University of Minnesota
  • Image: 2

    Credit: Chaz Hesselein, Bugwood.org

  • Image: 2

    Credit: L. Jap, University of Minnesota

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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: 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 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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