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Pruning Existing Stubs

This is a little bit off topic because the specific trees I am dealing with are avocados. But, I think the same question and answer could be applied to most trees, including figs.
 
I have about 70 large, Haas avocado trees, probably around 20 years old. The trees were around 15 feet tall up until about a year ago when they were cut back to less than 10 feet. They have already put out new branches to replace the ones that were cut, and those new branches have already been thinned out, leaving the trees in pretty good vase form. The problem I see is that when the large branches were cut back, they were stubbed, leaving about 8 inches sticking out past the bark-branch collar. If I had pruned these trees, I would have cut right at the bark-branch collar. 
 
So, my question is, now that these trees are already stubbed and the stubs healed over, should I leave them alone, or should I go back and remove the stubs, cutting them back to the bark-branch collar? These were large branches, so each cut will end up leaving a new wound of around 8 inches diameter, with a dozen or so on each tree. That's about 840 saw cuts, so I also don't want to do this unless the trees will suffer by my not doing it. If I am supposed to cut them, is there an optimum time of year? By the way, they are all on frost-free land, if that matters.

I can't answer your question but maybe you should join the Avocado growers assoc.  They HAVE to have a branch there!  Or stroll over to Atkins Nursery.  They could probably advise.  I keep calling waiting for a couple varieties I want to get in stock.  I either want Sharwil or Jan Boyce.  The best of the best!

Suzi

Cyberfarmer,
I'm not an expert on avocados but when pruning trees i always try to prune back to the branch bark collar. This is the preferred standard for shade and ornamental trees. This type of pruning encourages the tree to compartmentalize the wounds. Leaving stubs can encourage decay and epicormic or sucker branches. If the stubs have died back just removing the deadwood is a good sanitation practice. If the stubs have "healed over" I would probably leave them. Here on the east coast, I prefer to do most of my major pruning when the trees are dormant.
Good Luck
Kane

If the stubs look like they are starting to rot I would go ahead and cut them back.  If they are healed up and look healthy I suppose it would be fine to leave them.  Are they putting out sprouts from the stubs?

Could you post some pictures?

If I recall correctly, the new branches sprouted from the main trunk. The stubs are just stubs. I'll try to post some pictures. My camera phone seems to have taken it's last photo, so I'll have to find the regular camera.

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