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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Potato > White fuzzy growth on tuber

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Potato > Tuber > White fuzzy growth on tuber

1 of 2
  • Late Blight 1
  • Late Blight 2
  • Late Blight 3

Late Blight
Phytophthora infestans

  • Powdery white fungal growth can be seen on infected tissue in wet weather
  • Irregular sunken, dull brown to purple lesions around the eyes on potato tubers
  • Inside of potato tuber has a reddish-brown dry rot
  • Large irregular olive to brown leaf spots that are not restricted by leaf veins
  • In wet weather, leaves, stems and petioles rapidly turn brown and shrivel
  • More prevalent in years of cool and wet weather
  • More information on Late Blight...
2 of 2
  • 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...

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