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1.Healthy seeds collected from disease free fields should be used.
2. Destruction of weeds, collateral hosts and crop residues can greatly reduce the primary inoculum and terminal disease severity.
3. Seedlings should be raised in the water covered seed beds. Seedlings raised in upland nurseries are more susceptible to blast even after they are transplanted. Rice varieties with lower silicon content in the epidermal cells are after affects.
4. Adjustment of sowing time to avoid the coincidence of most susceptible stage of the crop with favorable weather conditions. In general, the late planted crops suffer more from the blast infection.
5. Balanced and split application of nitrogenous fertilizers should be practiced. Application of farm yard manures (FYM) should be encouraged.
6. Continuous maintenance of standing water has been found to reduce the blast severity.
Rice Blast Disease and its Management ( Dr. Krishnaveni)