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Management of Sheath blight Rice

Sheath blight: Rhizoctonia solani Kuhn.(Deuteromycotina: Mycelia Sterilia)

Local name: Yele Kavachada Macchhe Roga

Vernacular Name: Snake skin disease

  • Sheath blight is a fungal disease, more common in rainy season than in dry season in the topics.
  • This disease is problematic in areas where irrigation facilities are abundant.
  • Due to blighting of the leaf sheaths, it is commonly called as sheath blight.

Period of occurrence: Tillering to milk stage

Extent of yield loss: On an average, 20 to 50% annual yield loss

Alternate hosts: Among the plants recorded as hosts are, sugarcane, bean, soybean, tomato, egg plant, tobacco, water hyacinth , hyacinth bean and green gram

Favourable conditions for the pathogen:

  • High temperature (28-32°C)          
  • High relative humidity (>96%)                     
  • Frequent rainfall
  • High doses of N
  • Close planting


Mode of transmission/dissemination: Seed, Soil, Wind, and Water.

Sources of inoculum: Sclerotial bodies left in the field from previous crop and weeds, Mycelium in the plant debris.  

Damage symptoms:

  • Appearance of one or more relatively large, oblong or irregularly elongated lesions on the leaf sheath; in advanced stages center of the lesion becomes bleached with an irregular purple brown border.
  •  Initially these lesions are white in colour later it turns to dark brown.
  • At severe condition drying of leaves.



 Cultural Practices:

  • Moderately Resistant Varieties: Swarnadhan, Vikramarya, Radha, Pankaj, Manasarovar, Mandya Vijaya.  
  • Avoid using infected seed. 
  • Apply moderate 'N' levels (80-100 kg/ha) in 3-4 splits. 
  • Avoid excess 'N', skip final 'N' in sheath blight infected fields. 
  • Destroy stubbles / weeds, etc
  • Check brown plant hopper population 

Chemical control

  • 1g of carbendazim 50 WP(540g/acre) or 2g mancozeb 75 WP in 1 liter of water.
  • Seed treatment with carendizm 2.0g/kg of seeds.
  • Spraying fungicides of 1g carbendazim 50WP (540g/acre) or 2.0g mancozeb 75WP OR 1ml hexaconozole in 1 liter of water.

Source: UASD, DRR & UASB Package of practice


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