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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Sweet corn > Deformed or distorted leaves

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Sweet corn > Leaves > Deformed or distorted leaves

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  • Image: Black Rot 1
  • Image: Black Rot 2
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Corn Smut
Ustilago maydis

  • On ears, kernels swell into large pale green to silvery brown galls, up to five inches in diameter
  • As the galls on ears mature, they turn purplish black and become spongy
  • Powdery, black sooty spores emerge from cracked galls
  • Raised, firm pale green to brown bumps form on leaves, stems and tassels
  • More information on Corn Smut...
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  • Image: Fusarium Wilt 1
  • Image: Fusarium Wilt 2
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Corn Leaf Aphid
Rhopalosiphum maidis

  • Exude a sticky, shiny substance called "honeydew"
  • Large numbers can occur on tassels
  • Large numbers may cause curling leaves or yellow discolorations on the leaves
  • Aphids are blue-green to gray and are small (1/8 inch or less), soft-bodied, and pear-shaped
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  • Image: Fusarium Wilt 1
  • Image: Fusarium Wilt 2

Virus
Dwarf mosaic and maize chlorotic dwarf

  • Leaves have light and dark green mottling or streaks
  • Infected plants are stunted and may produce many tillers
  • Plants may not produce an ear, or ear is poorly developed
  • More information on Virus...

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