PLRV infects members of the family Solanaceae. The most economically important host is the Potato, "Solanum tuberosum" spp. In potato, symptoms of primary infection, infection in the growing season, occurs in the youngest leaves. Leaf margins become necrotic, turning brown and purplish and curl inwards towards the center of the leaf. Secondary infection, which starts from infected potato culls, produces more severe symptoms. Leaf rolling is more apparent and the entire leaf can become chlorotic and sometimes also has a purple discoloration. Necrosis of the phloem tissue particularly in the haulm is observed after onset of symptoms. Plants infected with PLRV experience stunted growth and produce smaller tubers. Infected tubers retain normal shape but experience necrosis of the vascular tissue. Necrosis of the tuber may not be apparent at harvest and can develop in storage. This usually appears as small brown spots scattered throughout the tissue.