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

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Spirea > Leaves > Curled, cupped, or distorted leaves

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

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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
Podosphaera oxycanthe

  • White spots or blotches on leaves
  • In severe cases leaves may be completely coated with white powdery fungal growth
  • Leaves may be stunted, reddened, scorched and curled or puckered by midseason
  • More information on powdery mildew...

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