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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Annuals and Perennials > Petunia > Malformed, cupped or distorted leaves

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Petunia > Leaves > Malformed, cupped or distorted leaves

1 of 4
  • Plant growth regulator herbicide injury 1
  • Plant growth regulator herbicide injury 2
  • Plant growth regulator herbicide injury 3

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

  • Leaves are twisted, cupped, or distorted
  • Leaves may appear thick and leathery
  • Veins in leaves are thick and close together
  • Side of the plant closest to the herbicide application is most severely affected
  • Different species of plants in spray area will show similar symptoms
  • More information on herbicide injury
2 of 4
  • Tobacco mosaic virus 1
  • Tobacco mosaic virus
  • Tobacco mosaic virus

Tobacco Mosaic Virus (TMV)

  • Symptoms may vary depending on cultivar, age of plant and other factors
  • Leaves have a mosaic pattern of light and dark green
  • Leaves may be distorted, curled or twisted upward
  • Lab test needed to identify which virus is causing the problem
  • More information on TMV
3 of 4
  • Impatiens necrotic spot virus 1
  • Impatiens necrotic spot virus 2
  • Tomato spotted wilt virus

Impatiens Necrotic Spot Virus (INSV) or Tomato Spotted Wilt Virus (TSWV)

  • Symptoms may vary depending on cultivar, age of plant and other factors
  • Brown to black ring spots or flecks on leaves
  • Plants may be stunted and have distorted leaves
  • Severely infected young plants may turn brown and die
  • Lab test needed to identify which virus is causing the problem
  • More information on INSV and TSWV
4 of 4
  • Powdery mildew 1
  • Powdery mildew 2
  • Powdery mildew 3

Powdery Mildew
Oidium sp.

  • Powdery, fluffy white spots or blotches on leaves, stems, and flower parts
  • Tiny black round spheres may be visible within white spots late in the season
  • Spots typically start on lower leaves but can spread to cover the entire plant
  • Severely infected leaves may be completely covered in white or grayish white fungi
  • In some cases, leaves become curled or twisted or turn yellow due to the infection
  • More information on Powdery Mildew

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