In the spring of 2012, I attempted to graft a Pear scion onto my apple tree using Winter Banana Apple as an inter stem. (All of he grafting i do is "Whip and Tongue" grafts wrapped in grafting tape. I then coat the wrapped union with grafting wax) The parent branch was a Winesap Apple branch with a grafted Winter Banana Apple scion from a few years before. (I actually have two of these paired branches.) I then attempted to graft two "Kieffer" Pear scions onto my two Winter Banana Apple inter stems. The "Kieffer" Pear scions started to grow, but died a few weeks later. This spring (2014) I attempted to graft this Apple / Pear union again using the same Winter Banana Apple inter stems. I had just enough branch on my Winter Banana branches to try this experiment one more time. This time around, I used "Sunrise Pear" scionwood. The grafting was a screaming success! (I had enough "Sunrise Pear" scionwood to graft two branches onto my apple tree, and two more onto an ornamental pear. All four pear grafts were a success!) I have no idea why this experiment failed in 2012 and was a success in 2014. I do not know if it had to do with the pear variety used, or if it had to do with environmental circumstances. I will re-post in 2015 with an update. There are a few different treads on this subject so I will be re-posting on those threats also. Below are pictures taken on 07/27/2014.

In my zone if we can graft on chokecherry or anything that help on hardiness of the climate we will make a considarable step in the progress and this succes we badly need it because what is on the market is about all not made for in our place,fact is that the destruction of our trees by winter season breake the courage of many and teach to our children to keep away from it.This year was the worst winter season in 35 years and find something for our place is greatly necessary.I have made reaserch for what i say and the results of it are speaking.I bless every try or efforts that are made for even a drop to success in giving possibility to fruit trees to stay here alive adding lot of hapiness to many homes....

The Howard Miracle graft took really well, and is out growing the apricot.. However, it picked up some kind of bark problem and I thought it was dying...but it's still going. The Apricot is in a 15 gal container, so that must put some limits on the entire tree, but the Howard Miracle's growth has been impressive. I can't report on the fruit because I haven't always remembered to hand pollinate and some large animal has been climbing up the tree, eating all the leaves and breaking off the branches that were blooming. So it's a work in progress.

Found some more info on Mustang. Bit more info here: https://www.yumpu.com/en/document/view/54044187/mustang-rootstock1 Here is some info on one of the breeders: http://www.jeffriesnurseries.com/colman.htm And I found the Canadian Breeders registration http://www.inspection.gc.ca/english/plaveg/pbrpov/cropreport/pru/app00006054e.shtml The cross is an interesting one! Prunus salicina x P. americana x P. pumilla var. besseyi Could this be a USA source? http://www.qscaping.com/20000147/Plant/20366/Mustang_Plum-Apricot