Bacterial wilt, scab and soft rot of potato

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Presentation transcript:

Bacterial wilt, scab and soft rot of potato Next

Bacterial Wilt or brown spot (Ralstonia solanacearum) Symptoms: The disease affects both above and underground parts of the plant. Infected plants show sudden wilting and complete collapse of plants. Vascular browning is the characteristic symptom of the disease. End Previous Next

Bacterial mass ooze out from the cut ends of the stem. Infected tubers are the main source of infection from one place to another. Bacteria spread from plant to plant by root contact or through water films. Increase in the temperature enhances wilting and high soil moisture favours survival of pathogens in soil. End Previous Next

Epidemiology Infected tubers are the main source of infection from one place to another Bacteria spread from plant to plant by root contact or through water films Increase in the temperature enhances the wilting and high soil moisture favours survival in soil End Previous Next

Management (Bacterial wilt) Use of disease free tubers for planting. Crop rotation with non host crop plants (maize, sorghum, garlic, onion, cabbage etc) Avoid injuries to the tubers during intercultural operation. Seed tuber treatment with bio control agents ( Bacillus subtilis, Pseudomonas florescens) End Previous Next

Potato scab (Streptomyces scabies) It is caused by a soil borne pathogen. The same organism also attacks many other root crops like beet, radish, turnip and carrot. Symptoms Two phases of scab viz. shallow and deep scab are found. Shallow scab consists of a superficial rough area on the skin of tubers. Deep scab consists of lesions which are 1-3mm or more deep and darker than the shallow lesions. The tissues of the pits are corky in both the phases. End Previous Next

Epidemiology Pathogen introduce into the soil through infected tubers and survives indefinitely once soil is contaminated Survive on decaying plant debris End Previous Next

Management Use disease free seeds Green manuring before planting will reduce infection Irrigate the land at regular intervals for keeping the soil moist from the time of tuberization. This will check the disease incidence End Previous Next

Soft rot & black leg (Erwinia carotovora) Symptoms It occurs in two phases viz., black leg of shoots and soft rot of tubers. In black leg phase, black lesions appear at base of the stem followed by yellowing, rolling of top leaves Tuber develops water soaked areas which rot and emit an offensive odor in the soft rot phase Small sunken areas develop on tuber surface End Previous Next

Epidemiology Moisture and temperature are factors affecting soft rots Infection occurs at 94 – 100 % Relative Humidity and temperature of 21-29 0C Immature tubers are more susceptible End Previous Next

Management Cut and injured tubers should be discarded Avoid prolonged wetting of tubers Store and transport the tubers under well ventilated conditions. End Previous