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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Potato > Collapsed seedling

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Potato > Seedling > Collapsed seedling

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  • Black Scurf/Rhizoctonia Canker 1
  • Black Scurf/Rhizoctonia Canker 2
  • Black Scurf/Rhizoctonia Canker 3

Black Scurf/Rhizoctonia Canker
Rhizoctonia solani

  • Delayed or no emergence, have few stems, and poor growth
  • Underground stems and roots have brown, sunken dry spots
  • Small hard black spots stick to the skin of the tuber like dirt that won't wash off
  • Tuber production is low, tubers may be small and deformed
  • In severe cases, small green tubers form on the stem above ground
  • Stem has a white to gray flaky growth just above the soil line.
  • Most problematic in cool wet soils
  • More information on Black Scurf/Rhizoctonia Canker...

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