Black Gram Leaf Crinkle: Leaf Crinkle Virus
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 the majority of these deaths 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 anywhere on the leaf lamina.
The disease develops in the fields mainly through seed or rubbing of diseased leaves with the healthy ones.
- Growing resistant varieties such as VBN 4, VBN 6 and VBN 7
- Seed treatment with Dimethoate (or) Imidacloprid @ 5 ml /kg
- Installation of yellow sticky traps 12 nos/ha
- Rogue out the infected plants up to 45 days
- Foliar spray of notchi leaf extract 10% at 30 DAS or neem formulation 3 ml/lit
- Spray methyl demeton 25 EC 500 ml/ha or dimethoate 30 EC 500 ml/ha or thiamethoxam 75 WS 1g /3 lit and repeat after 15 days, if necessary.
- TamilNadu Agritech Portal