Symptoms observation of a viral infection in the vineyard

In parallel with laboratory analyzes of GLRaV-3 genetic diversity that we had detected in autochthonous varieties, since spring we have been monitoring the occurrence and intensity of symptoms of all viral diseases on grapevine plants in collection vineyard. The first symptoms we noticed were the yellowing and leaf malformations associated with viruses from the infectious degeneration group. With the beginning of the summer, symptoms of leaf redness between leaf veins began to develop in grapevines infected with viruses from the leafroll associated virus group. Over time, these leaves became redder and twisted. Because of this symptom of leaf downrolling, leafroll viruses justifiably bear the name given.