Major diseases of Cassava are:-
1.Cassava Mosaic Disease: Indian cassava mosaic virus
Symptom:
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Mosaic symptom, reduction in leaf size, misshapen twisted leaves.
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The affected plants stunted, tuber splitting and yield reduction.
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The virus spreads by infected setts and whitefly Bemisia tabaci
Management:
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Selection of setts from healthy plants
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Rouging infected plants in the field at early stage
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Management of whitefly by installing yellow sticky traps, removal of weed hosts, spray Neem oil 3% or Methyl dematon @ 2ml/lit.
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Spraying of systemic insecticide like dimethoate 1 ml/lit to control the vector
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Use of resistant variety CTCRRI Co (TP)5- Sripadmanaba suited for Tamil Nadu and Kerala.
2.Cassava Brown leaf spot: Cercospora henningsii
Symptom:
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Spots are produced on both the sides of leaves.
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On upper surface, brown spots with dark border appear.
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On the lower side of the leaf spots with a grey centre and less distinct margin appears. The infected leaves turn yellow and dry up.
Management:
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Spray with Copper oxychloride 0.25%.
Source-
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TamilNadu Agritech Portal
