@ Aaron
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You should tram the tops too, since the tree is still dormant. that way there will be less for the tree to carry.
Maybe you missed the posts above where I described this as a 2-phased project. The main branches at the base of the layer will each have their own layers, which by definition removes at least one third of the burden on the main layer.
Also, although not easily visible from these photos (taken mainly from a distance in order to get most of the tree in the frame and facing the sun - which doesn't help), the shoots have actually turned green and started to sprout leaves. My guess is that dormancy is now over, and besides, I'm too greedy to start pruning now (except possibly for cuttings).
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I have been air layering my Dorset and Fuji, stared in end December and I am just starting to see some very few white roots towards the cellophane wrap... 3 months... when do I cut the trunk separate?
Hmm, I'm a bit wary about advising others when to remove a layer, notwithstanding this thread. I rely on direct visual inspection of the root system to assess when my layers are ready, and since this option is not open to me for your layer, I can only give general advice.
Firstly, is the root system florid? Do most (or at least a lot of the) roots reach to the bottom of the container? Have they started to change color from white to various shades of off-white, brown and orange, etc? If your answer to all these questions is yes, then I'd say your layer was ready for 'excision'.
Sorry I can't be more specific, but as I said, a lot of this is down to judgement based on a visual inspection. Going by your description, I'd say you need another 4-6 weeks before you can consider separation. But whatever you do, don't forget to keep it moist. And I've always found that a very dilute liquid feed in the latter weeks also helps.