Yellow Leaf disease |
Symptoms:
- This disease affects the 5 to 6 months crop.
- Yellowing of midrib and adjacent laminar region also yellowing.
- Subsequent leaf drying along the mid rib in 3 to 5 leaves from top.
- In some cases reddish discolouration is also seen
- In severe cases drying of spindle along with leaves.
- Stunted growth of cane, particularly internodes are affected
- Identify the disease in long distance itself
- Some times in severe cases it shows the bunchy top appearance at top of cane
- In matured cane this disease will spreads heavily
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Yellowing of leaf |
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Yellowing of midrib |
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Drying of leaf |
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Pathogen:
- The virus is transmitted by aphids, Melanaphis sacchari and Rhopalosiphum maidis, in a semi-persistent manner.
- SCYLV is a member of the Luteoviridae family. The virus is localized within the phloem cells of the plant.
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Melanaphis sacchari |
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Rhopalosiphum maidis |
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Management strategies
Cultural method:
- Selection of disease free setts for planting
- Field should be maintain with proper hygiene
- Application proper nutritional management and use resistant varieties.
- To avoid this disease first plant the setts in nursery and then transplant to main field
- Selection of tissue culture plant especially meristem culture plant is used for planting in field
Chemical method:
- Secondary transmission of the disease by insect vectors can be controlled by application of Malathion(0.1%) or Dimecron(0.2%).
- Soil application of carbofuran @2.0 kg./ha or phorate @ 6.0 kg./ha
- Two sprayings of malathion @ 1.5 kg /ha at monthly intervals during September and October after detrashing of dry leaves.
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Content validators:
Dr. T. Ramasubramanian, Senior Scientist, Sugarcane Breeding Institute, Coimbatore-641007.
Dr.V. Jayakumar, Senior Scientist, Sugarcane Breeding Institute, Coimbatore-641007.
Dr.M. Ravi, Assistant Professor, Sugarcane Research Station, Sirugamani, Trichy- 639115.
Source of Rhopalosiphum maidis: http://entoweb.okstate.edu/ddd/insects/cornleafaphid.html |
