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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Ninebark > Curled, cupped, or distorted leaves

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Ninebark > Leaves > Curled, cupped, or distorted leaves

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

  • Leaves, stems, and petioles are twisted, distorted, and/or cupped
  • Leaves may appear thick and leathery with parallel veins
  • Youngest tissue at branch ends affected
  • Distorted growth accompanied by or followed by leaves that turn brown or yellow
  • More information on plant growth regulator herbicide injury
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Non-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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Powdery 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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