An apparent mix-up within commercial sources of the vegetatively-propagated Marianna plum stocks with some other similar plum stocks has been revealed. Myrobalan plum seedlings, several vegetatively propagated myrobalan selections and two Marianna clones (2623 and 2624) have been commercially propagated for roostocks of stone fruits for a number of years. Of these, only the two Marianna stocks can be used successfully for almonds, and then only for certain varieties. Marianna 2624 is the more important because of its resistance to oak root fungus and is the one most often propagated for almond rootstock.