Failed air layer, what now?

[Akage]

I attempted an air layer and it failed. I don’t know what I did wrong. This is my second attempt with this tree. Last time it was healed over when I took it. This time it’s not. What can/should I do to ensure the health of the tree?
I already panicked and put wood glue all over the exposed cambium. Was this the right thing to do?

 

[Srt8madness]

There is no cambium there anymore, that is literally what you scrape off to make a layer.

How long did you leave the moss on the tree? Seems like a weird time to be undoing an air layer on a conifer done this year.

 

[Akage]

Okay, yeah I miss identified that. My bad. I used rooting powder and sphagnam moss. It wasn’t from a store though, the moss was collected from the wild.

 

[leatherback]

Not all species airlayer easy. Larch is one of the species that is harder to layer. If there are no roots, the wound has not been overgrown and the part you are layering of is still happy and healthy, you wait.

It has not failed. You have failed to be patient.

 

[Shibui]

I suspect @leatherback has the answer.

I already panicked and put wood glue all over the exposed cambium. Was this the right thing to do?

I think what you have identified as cambium is actually callus. That's where the tree is healing the wound and producing new wood and bark to protect itself. I don't think wood glue will harm the callus but the tree already had the problem in hand so the glue is not necessary.
It appears you have used the glue on the lower callus. That's not where the roots grow. Roots will grow from the callus at the top of the cut. Callus formation is usually the first step in root production. Put the sphagnum back on and cross fingers. I do not know of anything else that can be done.

 

[BrightsideB]

Unless you want to give up on it cut it off.

I’d just put the layer back on and forget about it. Maybe next spring it’ll start throwing roots out. Maybe earlier. Callus tissue started so that’s good. I can’t keep larch so I don’t know how well they layer.

 

[Bonsai_hope]

I suspect you didn’t remove all the cambium. I would cut away the callus and rescrape and start again with hormone and sphaghnum.

 

[leatherback]

I suspect you didn’t remove all the cambium.

Where in the picture do you see any indication that the cambium was not removed?