What apple rootstocks are commercially available?

There are currently at least 23 different apple rootstocks available from rootstock nurseries. Most fruit tree nurseries propagate apple cultivars on about 7 to 10 different rootstocks. The most common dwarfing rootstocks offered by nurseries include several clones of the dwarfing rootstocks M.9 (T-337, NIC 29, Pajam 2 and M-9 EMLA), Bud 9, and EMLA 26. Common semi-dwarf rootstocks include EMLA 7, EMLA 106 and EMLA 111.