Effect of chemicals on the spread of rice blast disease
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Twelve fungicides and two antibiotics were tested for their efficacy in controlling the spread of foliar blast and neck blast of rice caused byPyricularia oryzae Cav. in a highly susceptible cultivarCo. 13. The chemical 0-(4-bromo-2, 5-dichlorophenyl) 0-methyl phenylphosphonothioate 34% EC (Leptophos) at a concentration of lml/l of water was found effective in checking the spread of foliar as well as neck infection with a significant increase in yield. There was a negative correlation between yield and neck infection as well as yield and the spread of foliar blast. Yield was observed to be more associated with foliar blast rather than neck blast.
KeywordsGall Midge Neck Infection Rice Blast Disease Methoxy Ethyl Neck Blast
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