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11
Jul

Mode of spread and survival of Sheath Blight of Rice disease

The pathogen can survive as sclerotia or mycelium in dry soil for about 20 months but for 5-8 months in moist soil. It infects more than 188 crop species in 32 families. Sclerotia spread through irrigation water.
11
Jul

Favourable conditions for Sheath Blight of Rice disease

High relative humidity (96-97 per cent), high temperature (30-32OC), closer planting and heavy doses of nitrogenous fertilizers.
11
Jul

Pathogen for Sheath Blight of Rice disease

1. Rhizoctonia solani (Sexual stage : Thanetophorus cucumeris) 2. The fungus produces usually long cells of septate mycelium which are hyaline when young, yellowish brown when old. 3. It produces large number of globoses sclerotia, which are initially white, later turn to brown or purplish brown.
11
Jul

Sheath Blight of Rice disease

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Symptoms:

1. 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.

2. As the spots enlarge, the centre becomes greyish white with an irregular blackish brown or purple brown border .

3. Lesions o

11
Jul

Management of Brown Leaf Spot of Rice

- Field sanitation: Removal of collateral hosts and infected debris in the field. - Crop rotation, adjustment of planting time and proper fertilization are suggested. - Use of slow release nitrogenous fertilizers is advisable. - Use disease free seeds. - Resistant variety: Grow disease tolerant varieties like Birsamati, Birsa Vikas Dhan 110, Birsa Vikas Dhan 109, Hazaridhan, Sadabahar, Birsa Dhan 108, Shivam, Virendra, Sugandha and Rajashri showed resistance against brown leaf spot of ri
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