Final diagnosis


Alfalfa mosaic virus (AMV)

Bright yellow mosaic in large interveinal patches on several leaves of a young Burley tobacco plant. Alfalfa mosaic virus (AMV)
A highly marked yellow mosaic on a Burley tobacco leaf. Alfalfa mosaic virus (AMV)
A severe infection of Alfalfa mosaic virus (AMV) distortig a part of lamina of this Burley tobacco leaf.
Yellowing frequently affects the veins and the adjacent tissues. Alfalfa mosaic virus (AMV)
On the underside of this leaf one can observe foliar excrescences called enations. Alfalfa mosaic virus (AMV)
On the underneath side of this leaf, one can easily distinguish several leaf excrescences of cup shape. Alfalfa mosaic virus (AMV)
The viral particles of Alfalfa mosaic virus (AMV) are polyhedral and bacilliform, of 18 nm in diameter.