These two originated from M111 sprouts that were pull up and they still had a few roots attached. They were double grafted about February 2020 and planted in an undesirable location for backups. In this case the approximate 6" interstem was planted slightly above soil level so the tape could be removed from both connections during the summer. As you can see the M111 developed some roots up to almost soil level. If I decide to use these later I will probably plant them with about 1" of the Bud 9 interstem showing. Thought these might be of some interest if you are considering using interstems.
Left is M111/B9/Liberty. Right is M111/B9/control cross of Jonagold and Big Red June.