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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Sweet corn > Plant fallen over

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Sweet corn > Whole plant > Plant fallen over

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  • Image: Diamondback Moth 1
  • Image: Diamondback Moth 2
  • Image: Diamondback Moth 3

European Corn Borer
Ostrinia nubilalis

  • Kernels partly or completely chewed; brown droppings (excrement) is usually present
  • Stalks can fall over ("lodge")
  • Small holes should be evident on stalks, sometimes with brown frass coming out of the holes
  • Leaves have small holes, or "shot-holes"
  • Larvae are light brown or pinkish gray in color with round dark spots on each body segment. Mature larvae are about 1 inch long
  • More information on European Corn Borer...
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  • Image: Powdery Mildew 1
  • Image: Powdery Mildew 2
  • Image: Powdery Mildew 3

Northern and Western Corn Rootworm
Diabrotica barberi and Diabrotica virgifera virgifera

  • Adult corn rootworm beetles feed on corn silk which can reduce the number of kernels on the cob
  • In severe cases, very few kernels will be produced on the cob
  • Larvae feed on roots of corn, which can cause plant to fall over, or "lodge"
  • Northern corn rootworm adults are about 3/16th inch long and pale green; western corn rootworm adults are about 5/16 inch long, yellow to green in color with three black stripes running along the back of the beetle
  • More information on Northern and Western Corn Rootworm...

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