Black Gram Leaf Crinkle: Leaf Crinkle Virus
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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 the majority of these deaths 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 anywhere 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.
Management:
- 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.
Source-
- TamilNadu Agritech Portal
