Apple Rootstock Question
I have been watching a wild roadside dwarf apple tree for a number of years. This tree appears an ideal rootstock in many ways. It is a dwarf tree with a solid fat trunk. It is about 7 feet tall and is heavily spurred. The branches form almost a horizontal terrace growth pattern. The only draw back is that it crops very heavily every other year and not a single apple the years in between. Do biennual rootstocks impart biennual fruiting habit to annual scion wood varieties grafted onto them? I want to make sure I am not shooting myself in the foot if I try to use this tree as a source of rootstock.