Potyviruses

Each virus produces similar symptoms and mixed infections are common. The first symptom is a clearing of veins, followed by development ofmosaic patternsor mottling consisting of irregularly shaped, dark green areas alternating with light green or yellow areas. Leaves on some species and cultivars are drastically reduced in size and growth is often retarded.Watermelon mosaic virustends to cause raised, blisterlike areas on leaves and to reduce leaf size severely.Zucchini yellow mosaic vi