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Sweet Potato Production Technology

Disease and their control

Black scurf

Black scurf observed on tubers. Affected Disease and their control:

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.

Plant show drying up. In infected tubers, at time of sprouting, black, brown color appear on eyes.

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.

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 6@0.25% (2.5gm/Ltr of water) for five minutes.

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.

Pest and their control

Sweet potato weevils

They damage the plant by feeding themselves on the epidermis of vines and leaves.

Treatment

To control weevils spray of 200 ml Rogor @150 ltr water per acre.

Tuber Moth

It is major pest in field as well as in storage. It make tunnel in potato and feeds on flesh. Use healthy and diseased free seeds for sowing. Use only well decomposed cow dung.

If infestation is observed take spray of Carbaryl@400gm/100ltr of water.

Aphid

Adult and nymphs, both suck the sap thus weaken the plant. In severe infestation, they cause curling and deformation of young leaves. They secrete honey dew like substance and Sooty, black mould is developed on affected parts.

Cut the foliage according region timing, to check infestation of Aphid. If Infestation of Aphid and Jassid observed take spray of Imidacloprid@50ml or Thiamethoxam@40gm/acre/150Ltr water.

Harvest

The crops get mature after 120 days of planting. Harvesting is mainly done when tubers get mature and the leaves turn yellow. Harvesting is done by digging tubers. It gives an average yield of 100 qtl/acre. Freshly harvested tubers are ready for market purposes.

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