I have a small plot of land where a few old trees exist.
For what I could gather, these are heirloom trees no longer commercially available, probably even local varieties: one pear (possibly two), one apricot, one peach and one cherry tree.
I would like to reproduce these trees without the need to use root stock.
Talking with arborists always returned the same kind of answer: not commercially viable, too long to obtain fruiting trees and even an argument that the new trees would become "wild" and never bear fruit or only bear unedible fruit. This one I find particularly wild...
Does anyone have any sort of experience trying this? Can anyone recommend a technique?
I've read about a technique that recommends wrapping branches in cloth, with a lump of soil in contact with the wood to promote rooting but the trees I want to prioritize are not eligible for it as they are extremely old, with very thin and frail branches.
Are there any others you would recommend or suggest?
The propagation method you mentioned is called air layering and it might work for you if done right (lots of videos out there show how to do it). Another possible option is taking cuttings from new growth (lots of videos on this too). Some trees respond better than others to each method. You could also try taking seeds from the fruit and growing them, but if the source tree was grafted, the seeds won't give you what you're looking for and you won't know for a very long time.
I would probably start with cuttings unless the trees need to be pruned anyway, in which case I would put some air layers on the branches that need to be pruned. As mentioned, the tree may not be as hardy on its own roots if it was grafted, but many grafted trees are just fine on their own roots.
If they are old trees. Might not have been grafted.
Even if the fruit bearing wood was grafted onto a root stock, let's take has an example a pear grafted onto a quince, seeds taken from the pear would manifest the gene pool of the pear. Quince genes would not manifest. But I wouldn't get the exact same pears I would be taking seeds from due to genetic recombination. Cloning is the only option.
The only tree I think is apt for getting air layering is the cherry but the others are too frail to have their branches loaded, so I'll try taking cuttings first.