Final diagnosis


Tobacco ring spot virus (TRSV)

Pale yellow concentric rings that become necrotic at margins are scattered on this Virginia tobacco leaf. Tobacco ring spot virus TRSV)
The patterns are often chlorotic rings (Ring spot), sometimes concentric and circular when located between the veins, more irregular when they impinge on one of them. Tobacco ring spot virus (TRSV).
The viral particles of the ring spot virus in tobacco (Tobacco ring spot virus, TRSV) are polyhedral, from 28 to 30 nm in diameter.
Many small, irregular, sometimes concentric necrotic rings, on this Virginia tobacco leaf (ring spot). Tobacco ring spot virus (TRSV)