Potato leafroll virus (PLRV;Genus Polerovirus; Family Luteoviridae)

Abstract

Symptoms of primary infection by PLRV consist of pallor and upward rolling of young leaves, especially at the base, with an upright habit. The edges of young leaflets of some cultivars may develop reddening. Secondary symptoms, in plants grown from infected tubers, are stunting of the shoots and upward rolling of leaflets, especially of basal leaves (Fig. 5.3.1), which become rigid and leathery. In some culivars of Solanum tuberosum ssp. andigena and other wild species grown in South America, leaf rolling is not a typical symptom of secondary infection. Such plants are stunted and their tip leaves develop marginal yellowing (enanismo amarillo) (Rodriguez and Jones, 1978).