An updating about the performances of Pinot Gris and Traminer vines affected by the GPGV trichovirus-related grapevine disease

This paper presents an update of a multi-year survey carried out in Trentino (North-east Italy) regarding Pinot Grigio and Traminer Aromatico grapevines, whether or not temporarily affected by a phytopathology linked to the recently discovered Grapevine Pinot gris Virus GPGV thricovirus (Giampetruzzi et al. 2012). Diseased plants show symptoms resembling mite infestations or Thryps. Symptoms occur in spring at the bud-break and are characterized by leaf malformation, chlorotic speckling or mottling, poor growth of shoots and inflorescences. Data regarding the number of buds, fertility and grape yield per vine are reported; and so for cluster, berry, stem, and pruning weigths. Symptomatic plants show a significant drop of production due to the lesser number and weight of cluster and berries. Seeds are also present in a fewer number. In few plants the reduced vigor affected also the choice of branches for pruning renewal, leading sometimes to plants’ death. The chemical composition of the grape from vines with and without symptoms are also shown