Diseases

Tobacco tissue necrosis

Nicotiana tabacum L.

Tobacco tissue necrosis most often manifests as a viral disease caused by Tobacco necrosis virus (TNV), which is transmitted by the soil-borne fungus Olpidium brassicae.

In the reference 4 varieties crop Tobacco, where this is mentioned in the description.

The TNV pathogen is represented by serotypes A and D and causes local brown spots on tobacco leaves, which can coalesce and localize along the veins. Systemic plant infection in Nicotiana tabacum occurs rarely, although necrotic lesions can also affect roots and stems.

Resistance to necrosis is ensured by a hypersensitive response mechanism, in which the plant limits the spread of the virus through local cell death. The assessment of cultivar susceptibility is carried out using a scoring system, where low values correspond to high resistance.

Necrotic lesions on tobacco may also have a different etiology, occurring during the development of wildfire, black root rot, alternaria leaf spot, or Tomato spotted wilt virus infection.

General information about the subject — on the page Tissue necrosis.

Sources8

Varieties of Tobacco mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.