The earliest symptoms appear on youngest leaves as chlorosis around some lateral veins and its branches near the margin.

The leaves show curling of margin downwards.

Some of the leaves show twisting.

The veins show reddish brown discolouration on the under surface which also extends to the petiole.

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.

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.  

The disease develops in the fields mainly through seed or rubbing of diseased leaves with the healthy ones