Dept of Agriculture Development 
SFAC KeralaIt is a disease characterized by yellowish patches on leaves.
Chlorosis of leaves starts at base of the infected leaf and progressing upwards.
Downy white to gray fungal growth can be seen on undersides of leaves.
The leaves become brown and necrotic.
A distinct margin on leaf between diseased leaf tissue at the base and healthy leaf tissue at the tip can be seen.
Green leafy proliferation of spikelets giving a brush like apperance is another characteristic symptom.
Rogue out the infected plants when found in the field.
Use quality disease free seeds.
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