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The earliest symptoms appear on youngest leaves as chlorosis around some lateral veins and its branches near the margin.
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The leaves show curling of margin downwards.
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Some of the leaves show twisting.
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The veins show reddish brown discolouration on the under surface which also extends to the petiole.
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Plants showing symptoms within 5 weeks after sowing invariably remain stunted and majority of these die due to top necrosis within a week or two.
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Plants infected in late stages of growth do not show severe curling and twisting of the leaves but show conspicuous venial chlorosis any where on the leaf lamina.
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The disease develops in the fields mainly through seed or rubbing of diseased leaves with the healthy ones.