
- Address : P.O. Box 11, Gannoruwa rd, Peradeniya, Sri Lanka
- E- Mail : director.hordi@doa.gov.lk
- Telephone :(+94) 081-2388011-12-13
- Fax :(+94) 081-2388234

Knol khol
Brassica oleraceae var.caulorape
Released Varieties
Climate requirements/ Areas suitable for cultivation
Soil
Seed requirement
Land preparation
Field establishment
Spacing
Fertilizer
Water supply/ Irrigation
Weed Control
Pest Management
Disease Management
Causal Organism: plasmodiophora brassicae
Symptoms
- Swelling or malformation on the main lateral roots those are called club roots and those galls appear like clubs or spindles on the roots.
- The crop can be completely destroyed due to damage
Management
- Keeping the soil at a slightly basic pH of 7.1 – 7.2 by the addition of agricultural lime and apply 2-4 t/ha of lime to raise soil pH.
- Use of disease free planting materials
- As well as the integration of crop rotation
Causal Organism : Erysiphe cruciferarum
Symptoms
- Small white patched on upper and lower surface which may also show purple blotching , later powdery layer can be seen which coats the leaves
- leaves become chlorotic and drop from plant
Management
- Plant resistant varieties
- rotate crops
- Remove all crop debris after harvest
- Remove weeds
- Application of surface sprays, dusts or vapors
Causal Organism: Peranospora parasitica
Symptoms
- Infections of downy mildew begin as irregular yellow patches on leaves
- These chlorotic lesions later turn brown
- If conditions are favorable white fluffy growth of the fungus develops on the undersides of leaves
Management
- Covering the nursery to protect it from rain
- In the morning , remove the cover and allow get the sunlight
- Apply of a fungicide containing tebuconazole (5 ml for 10 liters of water) for once is recommended.
Harvesting and Processing
Yield
This page will be available soon…
Till then, please access the Sinhala language page through below link.