Temperate Vegetables (1+1)

DISEASES

DISEASES

FUNGAL DISEASES

White rust: (Albugo candida)

• Rust like white raised pustules is formed on leaves and stems.
• Often these pustules coalesce to form large irregular erupted patches.
• Host epidermis ruptures easily giving a white powdery appearance to lesion.
• Fungus survives season to season in plant debris, in soil and also mixed with seeds.
• Moist cool (20-25^oC) weather favours the disease development.

Control measures:

• Treat the seed with carbendazim @3g/Kg seed.
• Apply copper oxychloride (0.3%) for effective control.
• Obtain seed from healthy plants.

Alternaria blight: (Alternaria brassicicola)

• Symptoms appear on leaves, stem, pods and seeds.
• On leaves, round yellow spots are formed.
• Centre of spot dries and drop-off.
• Disease is seed borne and also survives from season to season on diseased crop material.
• Hot and moist weather conditions are conducive for development of disease.

Control measures:

• Treat the seed with thiram 75WP @3g/kg seed.
• Spray copper oxychloride @ 0.3 per cent or mancozeb @ 0.25 per cent at 8-10 days interval.

Powdery mildew:

• All plant parts are covered by white powdery growth.

Control measures:

• Before observing symptoms, spray dinocap (0.05%) or wettable sulphur (0.2%) at 10-15 days interval.

VIRAL DISEASES
Radish mosaic:

• Characteristic symptoms of this disease are mosaic and mottling of young leaves often associated with interveinal chlorotic area which gradually increase in size.
• Finally coalesce to form irregular characteristic patches.
• Affected plants are stunted and their leaves are reduced in size.
• Disease is readily transmitted to radish by sap inoculation but not through the seeds.

Control measures:

• Disease spread can be minimized by the application of malathion @ 0.05 per cent twice or thrice at 10-15 days interval.