Dept of Agriculture Development 
SFAC KeralaIt is a disease characterized by yellowish to purplish patches on the leaves.
The first symptom observed are small light green-yellow lesions on the upper surface later showing on the under surface.
The spots turn yellow or orange as they enlarge.
During periods of high humidity a grayish white moldy growth is developed on the under surface of the leaf.
Later the leaf may become papery and die.
Cauliflower heads develop sunken black spots and rots.
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