Winegrowers Association of the German wine-growing area WÃ¼rttemberg was founded in 1986 as a "study group new oak barrels." It consists of companies that are the Barrique have prescribed. The name chosen later formed from the initial letters of the five founding companies and plays with the names of the Greek god of the underworld (hell) to the roasting of the barrels. These are Prince of Hohenlohe-Oehringen and Sonnenhof , Adelmann , Drautz-Able , JÃ¼rgen Ellwanger . Later there was the state teaching and research center Vineyard to ensure scientific support. The main objective of the association was that in Germany at that time and until the mid-1990s Barrique proscribed by appropriate action and, above all, high quality wines at a better image and recognition to help. The HADES-seal is awarded to only the best vintages, as part of a sensory Examination given by the members. Another organization with similar objectives, the German oak forum .