Main symptoms

On iceberg-type batavia, a mottling in broad yellow areas, circular to irregular, appears on the old and intermediate leaves (figures 1 and 2).

Ultimately, the older leaves often turn completely bright yellow, sometimes some leaf areas remain green. The blade frequently necroses. Unlike BWYV, the veins do not stay green and the leaves do not become brittle (Figure 3).

The middle leaves show a yellow and green deforming mosaic, accompanied by small necrotic spots (Figure 4).

The growth of the plant is affected in all cases. If the plants are infected at a juvenile stage, they will remain stunted and deformed (Figure 5); they can die.

At the seed-bearing stage, the bracts may present a more or less necrotic yellow mosaic. Many flowers drop prematurely or are sterile. Seed production is considerably reduced.