DISEASES

DISEASES

Fungal Diseases
Powdery mildew : (Erysiphe polygoni)
  • It is characterized by white powdery mass on foliage, pods and stems.
  • It is favoured by hot and dry climate.
Control Measures:
  • Spray dinocap@ 0.05per cent or wettable sulphur@ 0.2 per cent or carbendazim @ 0.05 per cent. Repeat after 10-15 days if necessary.
Fusarium wilt: (Fusarium oxysporum f. sp. pisi)
  • The disease is characterised by yellowing of lower leaves and stunting of plants.
  • Optimum temperature for development of disease is 25-28oC.
Control Measures:
  • Since wilt is soil borne, a long crop rotation is recommended.
  • Seed treatment with carbendazim (2.5g/kg seed) for two hours followed by spraying with carbendazim (0.05%) is recommended.
  • Avoid early sowing in badly infested soils. Follow three years crop rotation in infested areas.
Ascochyta blight: (Ascochyta pinodes, Ascochyta pinodella, Ascochyta pisi)
  • Infected plants wilt.
  • Roots become brown.
  • On stems and leaves, brown spots are observed.
Control Measures:
  • Use bold and healthy seed.
  • Treat seed with carbendazim (2.5g/ kg seed).
  • Spray carbendazim (0.1%) or mancozeb (0.25%) before appearance of flowers on infected plants.
  • Repeat after 10-15 days if needed.
Bacterial Diseases
Bacterial blight: (Pseudomonas syringae pv. pisi)
  • The disease affects all the aerial parts of plant.
  • It appears as spots on leaflets which are round, oval or irregular 2-5 mm in diameter and reddish with translucent center having dark brown margins.
Control measures:
  • Use clean healthy seed. Remove affected plants and weeds.
  • Treat seed with Streptocycline @ 0.01 per cent for 1-2 hours.
  • Spray the same chemical @0.01 per cent and repeat after seven days if needed.
Viral Diseases

Pea mosaic:
  • The diseased plants are pale, weak and dwarf.
  • The young leaves and stipules show general mottling.
  • Light brown discoloured areas are seen on petioles, stems and tendrils.
Control measures:
  • Control insect vectors carefully, pull out affected plants and burn them
  • Grow resistant varieties.
       
Last modified: Wednesday, 20 June 2012, 4:51 PM