1)Black scurf: Black speck observed on tubers. Affected plant show drying up. In infected tubers, at time of sprouting, black, brown color appear on eyes.
For planting use diseased free tubers. Before sowing, seed treatment with Mercury is essential. Avoid mono-cropping and follow crop rotation. If land kept fallow for two years then severity of disease is reduced.
2)Early blight: Necrotic spots observed on lower leaves. The fungus due which infestation occurred lies in soil. It rapidly spread in high moisture and low temperature.
Avoid mono-cropping of crop and follow crop rotation. If infestation is observed, take spray of Mancozeb@30gm or Copper oxychloride@30gm/10Ltr water at 45 days 2-3 times at 10 days interval.
3)Common scab: It survives in field as well as in storage. Disease is spread rapidly in low moisture condition. Light brown to dark brown lesion are appeared on infected tubers.
Use only well rotten cow dung for application in field. Use diseased free seeds for planting. Avoid deep planting of tubers. Follow crop rotation and avoid mono cropping in same field. Before sowing, treat seeds with Emisan email@example.com% (2.5gm/Ltr of water) for five minutes.