Diseases and Pests

Tobacco Mosaic Virus - TMV

The first symptom of this virus is a light green coloration between the veins of young leaves, followed by a mosaic that alternates the coloration of light and dark green areas on the leaves. Mosaic does not result in plant death, but if it occurs early in the season, plants are stunted and growth is retarded. What also occurs is “mosaic burn” to the lower leaves, especially during hot and dry climate spells. Symptoms may vary from light spots to crinkled leaves, and are sometimes taken for other virus diseases like CMV or PVY. Plants subject to some kind of stress or growth difficulty, both symptoms and damages look more serious.

The virus is transmitted mechanically, from plant to plant, or through contact, where man is the main spreader. For this reason, frequently, there is a bigger number of TMV-infected plants in some rows, where transmission occurred during planting or cultivation practices.

The virus can live in the soil for long periods of time, normally in the roots, crop remains or other host plants. After infection, there is no cure or remedy against this virus disease, which prompts the need for preventive measures. The best technique to avoid TMV infestations is the use of resistant cultivars.

In the case of susceptible cultivars, when there are small numbers of infected plants in the field, these should be removed in order to prevent the disease from spreading. When growers have more than one field, and one of them is infected, all cultivation practices should always start in the healthy fields, and then progress to the infected areas.

The Tobacco mosaic virus was once the most serious tobacco disease, but its economic importance diminished with the availability and use of resistant cultivars.

There are several good quality and high yield cultivars, resistant to TMV, released by ProfiGen.

Symptom disease pictures:

Mosaic symptom and typical burn in susceptible cultivars

Tipical symptom of TMV transmission on the row

Diseases and Pests

Tobacco Mosaic Virus - TMV

See also

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