How does limb branching work? Trying to visualize future growth to help with pruning

General Fruit Growing
#1

Looking at my peach and pear trees it seems like their branching habit is very different. The peach for example will have a branch coming off the trunk with dozens of 8 - 12 inch shoots all over it. The pears on the other hand will have a branch coming off the trunk with only a few, if any, 3 - 6 inch shoots.

I did a lot of limb training and spreading on the pears towards late summer so it looks almost too “open” now, with 3-4’ branches with a lot of space between them. The canopy looks like its… inefficient, with a lot of light passing through it when compared to the peach which looks “dense” with leaves filling out a lot of the canopy.

So my question is how does a tree decide to create shoots on a branch which will later become their own branches. Will the spaced-out looking canopy fill in on its own or do I need to do some pruning to induce branching?

Any website or documents on the technical details of fruit tree growth would be greatly appreciated.

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#2

This could fill a book .
But , in short .
Pears bear fruit on spurs ( very short branches)
And yes, I think your pear will fill in shortly
Peaches bear fruit on new ( one year old) branches)
And since you have a lot of new 1 ft long growth that’s good,you may have to thin these.

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