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Horticultural crops :: Vegetables:: Brinjal

Tobacco mosaic virus (TMV)

Symptoms 

  • Mosaic mottling of leaves and stunting of plants are the characteristic symptoms of potato virus Y Mosaic symptoms are mild in early stages but later become severe.
  • Infected leaves are deformed, small and leathery. Very few fruits are produced on infected plants.
  • The important symptom produced by tobacco mosaic virus is conspicuous mottling of leaves.
  • Leaves also develop blisters in advanced cases. Severely infected leaves become small and misshapen. Plants infected early remain stunted.
  • PVY is easily sap transmitted.
  • It is transmitted in the field through aphids, Aphis gossypii and Myzus persicae and perpetuates on weed hosts like Solanum nigrum and S.xanthocarpum.
  • TMV is transmitted by sap, contaminated implements and clothes, soil debris and hands of labour.
  • It can perpetuate on many cultivated plants like cucurbits, legumes, pepper, tobacco, tomato and weed hosts. The virus survives in plant debris in soil.
Healthy plant
Virus Infected plant
Mosaic

Management

  • Destroy all weeds and avoid planting cucumber, pepper, tobacco, tomato near brinjal seed beds and field.
  • Wash hands with soap and water before working in seed beds.
  • Prohibit smoking or chewing of tobacco who are handling brinjal seedlings.
  • Spray insecticides like Dimethoate 2 ml/litre or Metasystox 1 ml/litre of water to control the insect vectors.

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