The IVV-CNR Unit of Grugliasco (TO) has selected and registered in the National Grapevine Cultivar Catalogue more than 100 clones belonging to 25 cultivars of north-west Italy. The primary sources of these clones are preserved and pre-multiplied by the Grapevine Premultiplication Centre of Piedmont (CEPREMAVI), based in Alba (CN) and managed by Vivalb on behalf of the Region of Piemonte. Premultiplication supplies the commercial nurseries with propagation material of the “basic” category, i.e. selected and virus-free. In the 2013 campaign CEPREMAVI produced more than 37.000 “basic” grafted rootlings.
Mannini et al. (Mon,) studied this question.