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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Potato > Holes or cracks in tuber

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Potato > Tuber > Holes or cracks in tuber

1 of 5
  • Wireworms 1
  • Wireworms 2

Agriotus spp., Melanotus spp.

  • Wireworms burrow into and feed on the potato tuber
  • Larvae are thin, shiny, segmented , yellow to reddish-brown color, and approximately 1/4 to 1 ½ inch long
  • More common in gardens that were previously in grass or sod
  • Larvae can be found throughout the growing season
  • Leaves show no damage
  • More information on Wireworms...
2 of 5
  • Flea Beetle 1
  • Flea Beetle 2
  • Flea Beetle 3

Flea Beetles
Epitrix cucmeris, potato flea beetle and E. fuscula, eggplant flea beetle.

  • Larvae feed on potato tuber causing shallow tunnels
  • Adult feeding on leaves creates shallow pits and small, irregular holes giving it a "shot hole" appearance
  • Heavy feeding may cause wilting
  • Adults are small (1/16 to 1/8 inch long), black in color;
  • Larvae are very small (
  • Present throughout the growing season
  • More information on Flea Beetle...
3 of 5
  • Fusarium Dry Rot

Fusarium Dry Rot
Fusarium sp.

  • In storage, tuber develops a dry decayed cavity often with white fluffy fungal growth or pink to yellow spores inside
  • Tuber surface has sunken dark spots, eventually becoming wrinkled in concentric rings
  • Plant may not emerge, or may emerge small and weak
  • More information on Fusarium Dry Rot...
4 of 5
  • Brown Center / Hollow Heart 1

Brown Center / Hollow Heart

5 of 5
  • Corky Ring Spot 1
  • Corky Ring Spot 2
  • Corky Ring Spot 3

Corky Ring Spot
Tobacco Rattle Virus

  • Potato tubers can be cracked and malformed if infections comes in early
  • Leaves may have no symptoms or have yellow rings, spots and arcs
  • Stems may be mottled green and yellow
  • Brown rings and arcs form on the skin and in the flesh of tubers
  • More information on Corky Ring Spot...

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