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29
Jul

Management of Sheath Blight of Rice

- Avoid excess doses of fertilizers. - Adopt optimum spacing. - Eliminate weed hosts. - Apply organic amendments. - Avoid flow of irrigation water from infected fields to healthy fields. - Deep ploughing in summer and burning of stubbles. - Seed Treatment: with Carbendazim 50 WP or Beam (Tricyclazole) @ 2 gm/kg seed. - Seed treatment with biocontrol agent: Pseudomonas fluorescens @ of 10g/kg of seed followed by seedling dip @ of 2.5 kg or products/ha dissolved in 100 litres and dipp
29
Jul

Pathogen of Sheath Blight of Rice

Rhizoctonia solani (Sexual stage : Thanetophorus cucumeris).

The fungus produces usually long cells of septate mycelium which are hyaline when young, yellowish brown when old. It produces large number of globoses sclerotia, which are initially white, later turn to brown or purplish brown.

Mode of spread and survival of Sheath Blight of Rice: The pathogen can survive as sclerotia or mycelium in dry soil for about 20 months but for 5-8 months in moist soil. It in

29
Jul

Sheath Blight of Rice

 

Symptoms of Sheath Blight of Rice: 1. The fungus affects the crop from tillering to heading stage. Initial symptoms are noticed on leaf sheaths near water level. 2. 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 b
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