First Report of Peach latent mosaic viroid on Peach in Uruguay

Plant Disease
Mari Carmen HerranzVicente Pallas

Abstract

Peach latent mosaic viroid (PLMVd) (2) is widely distributed and causes yellow, chlorotic mosaics and delayed foliation, flowering, and ripening. Infected fruits display a cracked suture and are often dented, misshapen, frequently flattened, and discolored. In the greenhouse, PLMVd natural isolates are divided into severe or latent strains depending on whether they induce leaf symptoms on seedlings of the peach indicator GF-305. PLMVd was detected in 2001 during a survey in three locations in the Canelones Department, the main peach producing area in Uruguay. Fifty samples were tested for the presence of five viruses: Prunus necrotic ringspot virus (PNRSV), Prune dwarf virus (PDV), American plum line pattern virus (APLPV), Plum pox virus (PPV) and Apple chlorotic leaf spot virus (ACLSV); samples were also tested for the viroids affecting stone fruits, Hop stunt viroid (HSVd) and PLMVd. The analyses were completed with molecular hybridization using specific nonisotopic riboprobes for each virus (4). PLMVd, undescribed in Uruguay, was detected in 9 of 50 samples in three peach cultivars, Scarlet Pearl, EarliGrande, and Barcelo. The PLMVd-positive sample for 'Scarlet Pearl' showed mild mosaic symptoms on leaves whereas the two PLM...Continue Reading

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