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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Sweet Corn > Discolored leaves

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Sweet corn > Leaves > Discolored leaves

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  • Image: Aphid 1
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  • Image: Aphid 3

Nitrogen Deficiency

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  • Image: Aphid 1
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Potassium Deficiency

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  • Image: Aphid 1

Phosphorus Deficiency

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  • Image: Fusarium Wilt 1
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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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  • Image: Fusarium Wilt 1
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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: Aphid 1
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Stewart's Wilt
Pantoea stewartii

  • Plants infected early in the season wilt, remain stunted, and may die
  • Plants infected late season have pale-green to yellow streaks with wavy edges run parallel to the leaf veins
  • Older leaves may have scorched brown edges
  • Cut stalks exude a yellow sticky bacterial slime
  • Occurs rarely in Minnesota
  • More information on Stewart's Wilt...

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