Dept of Agriculture Development 
SFAC KeralaThe specific symptom of rapid and complete chlorosis, browning and then death of plant tissues.
The symptoms start as brown lesions on leaves with concentric rings resembling a target board.
Lesions are usually restricted to the older leaves and are surrounded by a yellow halo.
Small gray-black oval lesions with lighter centers may occur on stems and leaf petioles and occasionally on leaves .
Stem and petiole lesions enlarge and often coalesce resulting in girdling of the stem.
Defoliation is also observed.
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