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If you have to cut large branches, there is a good chance that the wood breaks at two-thirds of the cut. To avoid this, perform the operation in two steps. First realize a provisional sawing. Then a clean cut near the trunk, conducive to healing.

Prune without breaking: trunk

Work about 30cm from the trunk.
Make a cut below on one third of the diameter then another in withdrawal of 3 to 4cm on top.

Prune without breaking: breaking

The second cut yields the branch.
This gives you temporary sawing up stairs that do not cause the wood fibers to burst.

Prune without breaking: prune

A clean cut close to the trunk provides a regular surface.
Brush with a healing product to preserve the tree.

Video Instruction: Breaking the Fast: The Prune Verdict