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1. Disease cycle begins when conidia are deposited on rice leaves and germinate by producing a germ tube and an appressorium.
2. Under favorable conditions, symptoms within 4-5 days of infection.
3. Conidia are produced on the lesions 6-7 days after infection. The rate of sporulation increases with increase in relative humidity (RH).
4. A typical leaf blast lesion produces 2000-6000 conidia each day for about 14 days. Most of the spores are produced and released during night, particularly between 2:00 and 6:00 a.m.
5. Longer the dew period, more spores are released. These conidia are mostly disseminated by means of wind.
Rice Blast Disease and its Management ( Dr. Krishnaveni)