Temporal analysis of grapevine leafroll associated virus 3 epidemics

With the aim of investigating the dynamics of transmission of GLRaV-3, we report and analyse time-courses of infection incidence in various plots in one vineyard in Rias Baixas (Galicia, Spain). GLRaV-3 infection was close to 100% after 15 years monitoring the epidemic in several plots where P. citri was widely spread although with low density populations. In two plots, virus-free plants were planted close to infected ones and after 8–9 years more than 80% of the plants tested GLRaV-3 positive (average infection rates of 7.8–12.4% per year). The Gompertz model best fitted the epidemiological data.