The Italian "Ministero delle Politiche Agricole e Forestali" (Ministry of Agriculture and Forestry) maintains, among other things, a list of all grape varieties authorised in Italy. See under List of vine varieties.
Regarding grape variety cultivation quantities and statistics, see under the keywords:
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As honorary chairman of the Domäne Wachau, it is the easiest and quickest way for me to access the wein.plus encyclopaedia when I have questions. The certainty of receiving well-founded and up-to-date information here makes it an indispensable guide.
Hans-Georg Schwarz
Ehrenobmann der Domäne Wachau (Wachau)