Brown rot or Bangle blight Potato

Brown rot or Bangle blightRalstonia solanacearum


  • At the time tuber formation wilt is the main characteristic symptom.
  • In leaf symptom -wilt, stunt and yellowing. Browning of xylem tissue.
  • Eye buds are black in colour.
  • Bacteria ooze coming on infected tuber surface and emits a foul odour.


Identification of pathogen:

Mode of spread and survival:
  • Infected soil and seed tubers form the main source of the primary infection.
  • Brown rot affected plant parts decay and release masses of bacteria in the soil where these may remain viable from season to season.
  • The bacteria in the soil are disseminated by wind from one field to the other.
  • The infection usually occurs through wounds in the root system.
  • Temp 25to 35ºC , RH above 50 % and PH 6.2-6.6 favours for the development of disease.
  • Acid soil is not favourable.



  • Crop rotation of wheat along with potato
  • Use resistant varieties like Solanum pujera
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