Last winter or spring Pomona published an article I wrote titled Pruning By Numbers. It might be helpful for you to refer to that.
For mulberry trees it is also effective to train the branches you leave to a weep by pruning branches back to hanging wood. This won’t affect a branch like stub-cutting because the downward pointing piece you leave will send a hormonal message not to go vegetative at the point of the cut. I have successfully transformed Illinois Everbearings into a less vigorous weeping shape by doing this.
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