Final diagnosis


Dandelion yellow mosaic virus (DaYMV)

The precocity of the attack, the climatic conditions ... influence the expression of the symptoms. These are sometimes moderate. This is the case on this lettuce which shows a fairly generalized marbling particularly visible on the old leaves. <b> Dandelion yellow mosaic virus </b> (<i> Dandelion yellow mosaic virus </i>, DaYMV)
This lettuce affected by <b> dandelion yellow mosaic virus </b> (<i> Dandelion yellow mosaic virus </i>, DaYMV) shows poor growth; its habit is abnormal due to the numerous slightly deformed leaves.
Chicories are also affected; this escarole shows a fairly intense mosaic. <b> Dandelion yellow mosaic virus </b> (<i> Dandelion yellow mosaic virus </i>, DaYMV)
In some cases, the chlorotic spots can be larger and very pronounced. Their location is frequently related to the nervous network. <b> Dandelion yellow mosaic virus </b> (<i> Dandelion yellow mosaic virus </i>, DaYMV)
The affected leaves show various alterations: chlorotic spots, necrotic alterations, fine necrosis, sometimes giving the blade a slightly "tanned" appearance. <b> Dandelion yellow mosaic virus </b> (<i> Dandelion yellow mosaic virus </i>, DaYMV)
This lettuce, produced in winter, is severely affected by <b> dandelion yellow mosaic virus </b> (<i> Dandelion yellow mosaic virus </i>, DaYMV). Its growth is blocked and its young leaves are strongly deformed. The older ones tend to be chlorotic.
The <b> dandelion yellow mosaic virus </b> (<i> Dandelion yellow mosaic virus </i>, DaYMV) is characterized by its isometric particles, here present in large numbers.