Occurrence and diversity of Grapevine leafroll-associated virus 1 in Algeria.
A survey was conducted of central and western Algerian grape cultivars and a germplasm collection to detect the presence of Grapevine leafroll-associated virus 1 (GLRaV-1), using DAS-ELISA. The virus was found in 26 of 484 sample (5.4%). No infection was found in the germplasm collection. Analysis of the sequence of a coat protein gene region revealed that of the 17 recognised phylogenetic groups, the Alge- rian isolates belong to Groups I, II and XVI. This is the first study of genetic diversity of GLRaV-1 in Algeria.