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  Rice-Oryza sativa

Rice-Oryza sativa:

The pathogen:

The fungus Pyricularia oryzae while young possesses hyaline and septate mycelium. The color of mycelium changes to olive brown on maturity. Conidia are generated terminally. Every conidium is obpyriform septate along with a small basal appendage.

Control measures:

The very much economic method of control is the cultivation of resistant, high yielding varieties.

Seed treatment:

Immersion of the seeds in 0.2 % solution of Kalimat B for one day controlled the disease and promoted the growth of seedlings. The seed protectants like agrosan, cerasan and spergon have been confirmed accountable for the control of disease.

Sanitation:

Plant debris have to be collected and then destroyed. The secondary host plants like Digitaria marginata should be together from paddy fields and after that destroyed.

Spraying and dusting:
Blast disease can be managed efficiently by spraying the fungicide, Bordeaux mixture minimum 4 times before and after flowering of the crop. Bordeaux mixture formula is like this:

Copper sulphate    9 Kgs
Quick lime            9 Kgs
Water                   250 litres

For controlling blast the dusting of organomercuric compounds has been recommended.

 

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