An old, wise friend was telling me about "micro grafts", his term for basically grafting a tree when the root stock is less than the diameter of a pen.
His basis was:
1.) It leaves no graft weakness
2.) It leaves no graft fight (where the root stock tries to outgrow the scion, leading to enveloping of the weaker material)
3.) It was easier to do since the plant material is virtually 100% cambium at juvenile stages
4.) There is a lot of energy at the early sprout of root stock, which means that once the technique is mastered it can have a high rate of success.
Arguments against
a.) When the rootstock is young its very hard to manage (flimsy when cutting)
I have been trying this theory out on some young avos, and indeed, argument a.) is very hard to manage making the cut into the root stock. He mentioned this being done on avo and durian... nothing else, but I didn't ask.
Opinions?