Final diagnosis


Lettuce mosaic virus (LMV)

The <b> LMV 0 </b> type strain did not cause any discernible symptoms on this resistant variety of lettuce. <b> Lettuce mosaic virus </b> (<i> Lettuce mosaic virus </i>, LMV)
The <b> LMV 1 </b> type strain bypasses resistance and induces thinning of the veins and a yellow mosaic of the leaves of the heart. <b> Lettuce mosaic virus </b> (<i> Lettuce mosaic virus </i>, LMV)
The <b> LMV E </b> type strain, which bypasses resistance, is one of the most virulent and damaging strains on lettuce. There are often many blistered, deformed leaves, with a very marked mosaic and vein thinning. <b> Lettuce mosaic virus </b> (<i> Lettuce mosaic virus </i>, LMV)
Quite classically, the lettuce infected lettuce mosaic virus (<i> Lettuce mosaic virus </i>, LMV) have their leaves more or less mosaic and blistered.
Many leaves in the heart of this lettuce are heavily blistered, embossed ... <b> Lettuce mosaic virus </b> (<i> Lettuce mosaic virus </i>, LMV)
LMV can also induce embossing of the limbus and cause intense nerve yellowing, diffusing to surrounding tissues. <b> Lettuce mosaic virus </b> (<i> Lettuce mosaic virus </i>, LMV)
In addition to nerve clarifications, the limbus, slightly mottled and chlorotic, shows locally a localized "vein banding". <b> Lettuce mosaic virus </b> (<i> Lettuce mosaic virus </i>, LMV)
Careful observation of the limbus allows us to observe the presence of nerve enlightenments and darker colored blisters. <b> Lettuce mosaic virus </b> (<i> Lettuce mosaic virus </i>, LMV)
Following climatic contrasts or attacks from certain strains, necrotic changes are visible on the leaves. They can be tiny, localized for example at the ribs or arranged in wide areas. <b> Lettuce mosaic virus </b> (<i> Lettuce mosaic virus </i>, LMV)
In some cases, the blade may be more indented. This is the case of the curly chicory leaf on the left side; it contrasts with the healthy leaf on the right. <b> Lettuce mosaic virus </b> (<i> Lettuce mosaic virus </i>, LMV)
This curly chicory leaf, mosaicked by <b> Lettuce mosaic virus </b> (<i> Lettuce mosaic virus </i>, LMV), gradually necroses from the periphery of the leaf blade.
Flexuous viral particles 15nm in diameter and about 750nm long (potyvirus type). <b> Lettuce mosaic virus </b> (<i> Lettuce mosaic virus </i>, LMV)