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How to dwarf an apple tree
Do the first cut as soon as the tree has been planted.
Pruning the tree while it is still young and growing will ensure it takes to dwarfing. Try to do the first cut on the tree soon after it is planted at the end of winter.
OPT:
A). Prune apple trees when there are no fruit to produce, usually in the late fall. Cut down the apples with pruning shears, as they ripen quickly.
B). The tree will get used to the cut and won't be able to survive if you don't cut it off sooner. Remove any buds, seeds, or other growths from the tree.
C). Most apple tree varieties will take to dwarfing well. You may want to consult with a grower at your local gardening center or horticulture center to confirm the apple tree variety you have will be good for dwarfing.
D). The more mature the tree is, the sooner you can dwarf it. If you are making a curved cut, make sure you go from point a to point b.
C).