Paddy ​​​Sheath Blight

Paddy Diseases

​​​Sheath Blight

• The fungus affects the crop from tillering to heading stage.
• Initial symptoms are noticed on leaf sheaths near water level.
• On the leaf sheath oval or elliptical or irregular greenish grey spots are formed.
• As the spots enlarge, the centre becomes greyish white with an irregular blackish brown or purple brown border.
• Lesions on the upper parts of plants extend rapidly coalesing with each other to cover entire tillers from the water line to the flag leaf.
• The presence of several large lesions on a leaf sheath usually causes death of the whole leaf,
• In severe cases all the leaves of a plant may be blighted in this way.
• The infection extends to the inner sheaths resulting in death of the entire plant.
• Older plants are highly susceptible.
• Plants heavily infected in the early heading and grain filling growth stages produce poorly filled grain, especially in the lower part of the panicle..

• Favourable conditions:

  • Presence of sclerotia or infection bodies floating on the water
  • Presence of the sclerotia in the soil
  • Relative humidity from 96 to 100%
  • Temperature from 28-32 °c
  • High levels of nitrogen fertilizer
  • High seeding rate or closing plant spacing
  • Frequent rain

• Apply organic amendments viz., neem cake @ 60Kg/ac or FYM 5 tonnes/ha.
• Avoid flow of irrigation water from infected fields to healthy fields. .
• Deep ploughing in summer and burning of stubbles.
• Spray Carbendazim  200g /ac. Soil application of B. subtilis @ of 1 kg/ac after 30 days of transplanting.
  (The product should be mixed with 20 kg of FYM/Sand and applied).
  Foliar spray at 0.2% at boot leaf stage and 10 days later.(400 g/ac).

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Aries Trishool(Neemcake)

Bio Pesticides
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