In December 1999, on the initiative of Dr. Pierre Basler, 39 wine-growing experts founded the association "Internationale Arbeitsgemeinschaft zur Förderung von pilzwiderstandsfähigen Rebsorten e.V.", or "PIWI-International" for short, in Einsiedel, Switzerland. The founding members came from Germany, Austria, Hungary and Switzerland. They were convinced of the positive characteristics of the new innovative PIWI vine varieties and decided to jointly advance the research, promotion and dissemination of these varieties. At that time, it was particularly important to exchange experiences with young PIWI grape varieties such as Regent and Johanniter. They reacted differently to particular site and climatic influences.