A systematic approach to organize grapevine varieties’ naming at the international level while retaining their cultural heritage and allegiance across different countries and wine regions António 1* Graça , José 2 Manso , George 3 Sandeman 1Sogrape Vinhos S.A., R&D Department, 4430-809 Avintes, Portugal; * corresponding author 2ADVID – Associação para o Desenvolvimento da Viticultura Duriense, 5050-106 Godim (Peso da Régua), Portugal 3ACIBEV – Associação dos Comerciantes e Industriais de Bebidas Espirituosas e Vinhos, 1200-092 Lisboa, Portugal Abstract. Grapevine varieties’ names are used by farmers to distinguish plants in their vineyards, associating them with agronomic behaviours and oenological aptitudes. They also provide pedigree and a sense of origin to wines from territories where they are predominantly grown, often working as a communication key from producers to consumers. The OIV compiles an international list of grapevine varieties and their synonyms, which is available online and in print. The list results from merging national lists from OIV member and non-member countries. Because of no international naming agreement, the OIV database and list lack consistency across countries. This situation creates issues in the relationship between actors of the wine industry, from nursery supplying wrong materials to growers, growers supplying wrong fruit to winemakers and eventually retailers offering the wrong wine to consumers. In the last two years, Portugal and Spain revised their respective official varieties’ list incorporating innovations for naming varieties with increased objectivity. To organize objective naming internationally while retaining traditional associations with countries and wine regions, we propose to associate both Portuguese and Spanish approaches for a conflict-free international reference to sort out synonymies, thus evolving the OIV variety list into a more usable, harmonized and objective tool for all concerned sectors of the global wine industry. Conclusion. By implementing the proposed format, we believe a comprehensive, objective and more useful tool will be made from OIV’s list while, at the same time, preserving the geographical, cultural and historical value conferred by each and every synonym to the wine made from its respective variety. Proposal. Grapevine varieties are one important chapter of wine industry’s diversity, one that has been made important by the constant communication between producers and consumers about the role of varieties in the characteristics of the resulting wine. In order to safeguard credibility in this communication, it is important to have tools that constantly assist the progressive elimination of the existing confusion. One such tool is OIV’s “International list of vine varieties and their synonyms”, which is updated every year. We propose a new format for the list as shown in Table 1. This format will provide an objective reference while, at the same time keeping all synonyms used in all countries organized in a way that does not promote one synonym over the others. This is achieved by: Including a code made of a unique, random, 5-digit number to objectively reference each variety; Synonyms associated with each code should be listed by alphabetical order, following the code; Country(ies) where each synonym is used should also be listed after the synonym by alphabetical order. References 1. T. Lacombe, L. Audeguin, M. Boselli, B. Bucchetti, F. Cabello, P. Chatelet, M. Crespan, C. D’onofrio, J. Eiras Dias, S. Ercisli, M. Gardiman, M. S. 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