Disease Stage important Symptoms Season important Factors favoring infection Blast All growth stages  Leaf lesions- Grey Centers  large in the middle tapering  to ends Also attacks nodes  on stem Panicle attack  (neck rot) can be confused  with stem border damage Mostly wet cloudy skies Frequent rain and drizzle High N levels, High relative humidity Sheath Blight Tillering  Leaf sheath - Grayish green  lesions between the water  and the leaf blade Periodic High temperature and humidity High  levels of n High  yield levels Bacterial Leaf Blight Tillering to heading  Leaf lesions run along the  length of the leaf Wet High temperature and humidity Sheath Rot Boot leaf  Small water soaked lesions  on leaves Periodic High temperature and humidity Brown Spot Flowering to maturity  Brown round to oval spots  on leaves Periodic 25-30 degrees  centigrade temp  & High humidity False smut Flowering and maturity Ovaries transformed to  large green masses Periodic Rainfall accompanied by  cloudy days Tungro virus Flowering and maturity  Stunting of the plant &  yellow to orange laves Periodic Usage of more N  and more vector  activity

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