Zucchini yellow mosaic virus (ZYMV)
Infection of the top shoot (minor)
Yellow discolouration appears on the youngest leaves, the leaves curl and have bumps.
Infection of the top shoot (moderate)
The surface area of the leaf blade is smaller, the bumpiness on the leaves increases, the photosynthetically active surface of the leaf is reduced.
Infection of the top shoot (severe)
Leaves become stunted, curl upwards and fruits grow more slowly. Consequently, the plant loses its top.
Infection of the leaves (minor)
There is a visible discolouration on the leaves that persists until the leaves are removed.
Infection of the leaves (moderate)
The surface area of the leaf blade is smaller, the bumpiness on the leaves increases, the photosynthetically active surface of the leaf is reduced.
Infection of the leaves (severe)
Leaf infection can reach up to 80%, and the plant ceases to bear fruit.
Infection of the top shoot
The plant 25 days after the first symptoms of infection
Infection of the top shoot
Illustrative photo of the infection of the top shoot. The photo to your right illustrates the appearance of the top after 25 days.
Cucumber shoot infection
During a severe virus infection, necrosis appears on the shoots.