The behaviour between plum cultivars grafted on the almond x peach hybrids Adafuel and INRA GF 677 is studied. The compatibility at the union between stock and scion was estimated by internal examination of unions. When grafted on both hybrids, the european plum cultivars President and Reine Claude Tardive de Chambourcy, as well as the japanese plum cultivars Delbarazur and Friar had compatible unions. In opposition, european plum cultivars Marjorie Seedling and Stanley showed the presence of parenchymatous tissue in the wood at the point of union.Trabajo financiado por CICYT, AGR88/0074 y AGR91/0434, y por CONAI-DGA.Peer reviewed