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Agricultural crops :: Cash crops :: Sugarcane

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
     
  Yellowing of leaf   Yellowing of midrib   Drying of leaf
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.
     
  Melanaphis sacchari   Rhopalosiphum maidis  

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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