Performance of 'Gala' apple on eight dwarf rootstocks: Ten-year summary ofthe 1990 NC-140 rootstock trial

In 1990, trees of 'Gala' apple (Malus x domestica Borkh.) on 8 dwarfing roo tstocks were planted at 8 locations in North America according to the guide lines established for cooperative testing by the North Central regional coo perative project (NC-140). Rootstocks in this trial included MAC.39, P.1, O .3, M.27, B.9, Mark, M.9 EMLA, and M.26 EMLA. Tree survival was not affecte d by rootstock. P.1 produced trees with the largest trunk cross-sectional a reas, lowest yield and yield efficiency, and smallest fruit. O.3 and M.26 E MLA produced trees with similar TCSA, but M.26 EMLA was the least productiv e. Mark, MAC.39, B.9 and M.9 EMLA produced trees with similar TCSA, yields and yield efficiencies. M.27 produced trees with the smallest TCSA and rela tively low yields.