In Württemberg, Trollinger was crossed with the white grape Riesling to produce the cross Kerner in 1929 (received varietal protection and was released for general cultivation in 1969) [REF].
In 2010, DNA analysis suggested that the Emilia-Romagna wine grape Uva Tosca maybe a natural crossing between Trollinger/Schiava Grossa and Crepallochi [REF].