Fixing bad pruning

[greenfoot]

Inherited a lot of bad pruning jobs from prior owner, stubs everywhere, see pics. Some of the stubs have decay and I'm inclined to cut a bit of the collar that's grown up on the stub to get the tree to "re-heal" around a fresh cut. What do you think? got some pine, sycamore, crab apple, maple that have this, ugh.

 

[Raintree]

Don't cut the collar. Some of those stubs you can just knock out.

 

[greenfoot]

Ok so cut flush TO the collar if they can't be knocked out, after that dig out any rot or just leave it?

 

[Raintree]

Best leave it be.