• 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.

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.

Epidemiology :

• 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