The rooting and compatibility of ‘Börner’ rootstock with various wine- (‘Furmint’, ‘Regent’, ‘Riesling’, ‘Sauvignon Blanc’, and ‘Welschriesling’) and table-grape (‘Muscat Bleu’, ‘Ester’, and ‘Nero’) varieties were evaluated over two growing seasons. The ‘Börner’ rootstock was compared to the most prevalent rootstocks (‘5BB’ and ‘SO4’) in Slovenia. The trial based on a randomised complete block design with four replications (50 grafted plants per replicate). As an index of compatibility, the callus development and the percentage of first grade grafted vines were determined, as well as dry weight of roots in wine varieties in 2006. After the callusing process (heat forcing), the differences in callus development were greater between the years than among rootstocks, which were the most obvious with the wine-grape variety ‘Furmint’ as a scion. In 2005 there were 38% more grafts with a partial developed callus comparing to 2006, while in this particular year, for most varieties, the average percentage of the first grade grafted vines and the roots dry weight were higher when the ‘5BB’ rootstock was used. Lower grafting success of ‘Börner’ rootstock is more a result of less developed roots (loamy soils) as compatibility with various varieties.

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