Tobacco Leaf Curl

Tobacco Leaf Curl : Tobacco leaf curl virus

  • Leaf curl is fairly widespread in all tobacco tracts in India. Generally, the disease appears 3-5 weeks after planting and sometimes late in the nursery.
  • The virus is transmitted by an insect vector, white fly Bemisia tabaci. It is also graft transmissible but not by sap or seed. There are a large number of hosts of this virus as well as of its vector.
  • The most characteristic symptom of tobacco leaf-curl disease is the production of leafy outgrowths known as enations from the veins on the lower surface of the leaves.
  • Combined with this, is a stunting of the whole plant and twisting and curling of the leaves.
  • The manifestation of the disease varies greatly according to environmental conditions and the variety of tobacco concerned.
  • Remove and destroy the diseased tobacco seedlings before and after planting whenever they are seen in the field. Fill the gaps with healthy seedlings if it is not too late.
  • Alternate weed hosts for whitefly should be removed and destroyed.
  • In endimic areas, Sesbania sp. may be grown as a barrier crop around tobacco fields.
  • Install 12 yellow sticky traps (castor oil coated) per hectare to monitor the whitefly population. If 100-200 whiteflies stick to the trap the following insecticide schedule has to be adopted.
  • 1st spray      Chlorpyrifos 20% E.C. @ 25 ml. In 10 litres of water
    2nd spray     Monocrotophos 36%, W.S.C. @ 15 ml in 10 litres of water
    3rd spray     Acephate 75% S.P. @ 10 gm in 10 litres of water
    4th spray     Demeton-s-methyl 25% E.C. @ 15 ml in 10 litres of water
  • Spraying has to be done preferably in the evening hours (4-6 P.M) with high volume spraying and it should be ensured that the under side of the leaves also is covered.
  • Further, the spraying schedule has to be adopted on a community basis.



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