Spray 0:0:50 (N:P:K) to increase size of tubers because potassium play important role in increasing thickness of tubers. Apply irrigation again in this week.
Late Blight (Phytophthora infestans)
The infection appears at the tips or edges of the lower leaves with circular or irregular water soaked spots. White downy fungus growth appears on the underside of the leaves around the spots. Cloudy weather is conducive for very fast spread of the disease. In case of sever incidence all above ground parts may show rotting. Later the disease may spread to tubers and initiate rotting.
Control Measures–
- Plant only healthy disease free certified seed tubers.
- Spray the crop thoroughly with diathane M-45 (2.0 kg/ha) or diathane Z- 78 (2.5 kg/ha) or difolatan (2.5 kg/ha) well in advance to general appearance of disease. The spraying operations should remain continue at narrow interval of 5 to 6 days during cloudy weather.
- Dig out tubers when foliage is completely dry or cleaned.
- Grow late blight resistance varieties like Kufri Navaharl.
- Avoid applying in excess nitrogen and irrigation
Jassids-
They are slender wedge shaped green hopping insects. They are diagonally. They suck sap from under surface of leaves causing yellowing, curling and later burning of leaves called ‘hopper bums.
Control Measures-
1. Spray the crop with metasystox at 0.1 per cent.
2. Apply thimet 10 g granules at 10 kg per hectare in furrows at the time of planting.
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