By Gracie1402
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One of the biggest pruning mistakes is cutting off branches in the wrong place. Without knowing it, many people tend to leave too much of a stub when removing branches. Once the stub dies off, it makes an entry point for disease and insects. Trees have a natural defense system built into to them (right where the trunk intersects the branch), known as the "collar". It is important to do your best to make a flush cut without removing the collar. Cuts should be made just beyond the collar without leaving a stub but leaving the swollen area.
eHow Member: Gracie1402