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

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Potato > Stem > White fuzzy growth on stem

1 of 2
  • White Mold 1

White Mold
Sclerotinia sclerotiorum

  • Fluffy white fungal growth and small hard black fungal sclerotia can be found on or in infected stems
  • Elongated tan dry lesions form on stems
  • Leaves wilt but remain green
  • More information on White Mold...
2 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...

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