Yellow Leaf disease
Symptom:
- 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 the top.
- In some cases, reddish discolouration is also seen
- In severe cases drying of spindle along with leaves.
- Stunted growth of cane, particular 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 spread heavily.
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.
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 de-trashing of dry leaves.
Source-
- TamilNadu Agritech Portal
