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Sweet corn > Leaves > Discolored leaves

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  • Image: Aphid 1
    Credit: Gordon Johnson, University of Deleware
  • Image: Aphid 2

    Credit: R.L. Croissant, Bugwood.org

  • Image: Aphid 3

    Credit: R.L. Croissant, Bugwood.org

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green arrowNitrogen Deficiency

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  • Image: Aphid 1
    Credit: Bill Steenwyk, Michigan State University
  • Image: Aphid 2

    Credit: John E. Sawyer and Antonio Mallarino Iowa State University

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green arrowPotassium Deficiency

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  • Image: Aphid 1
    Credit: R.L. Croissant, Bugwood.org
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green arrowPhosphorus Deficiency

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  • Image: Fusarium Wilt 1
    Credit: T. Zitter, Cornell University
  • Image: Fusarium Wilt 2

    Credit: T. Zitter, Cornell University

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green arrowVirus
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
    Credit: E. Burkness, University of Minnesota
  • Image: Fusarium Wilt 2

    Credit: E. Burkness, University of Minnesota

  • Image: 3

    Credit: E. Burkness, University of Minnesota

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green arrowCorn 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
    Credit: J.K. Pataky, University of Illinois at Urbana-Champaign, Bugwood.org
  • Image: Aphid 2

    Credit: J.K. Pataky, University of Illinois at Urbana-Champaign, Bugwood.org

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green arrowStewart'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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