- High relative humidity (90 per cent).
- water logging condition.
- light drizzles with a temperature of 20-250C favours the disease development.
- Young plants are highly susceptible.
Spread and Survival:
- Survive: soil, plant debris and graminaceous collateral hosts (Sorghum bicolor, Sorghum halapense, etc). The oospores survive in the soil as well as in the infected plant debris.
- Spread: air-borne conidia.
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