good morning everyone,
I have a nice little sucker that is coming from the roots on my Celeste tree, now my question is when is a good time to try and transplant this little guy into a separate pot? can I do it this time of the year, and will it affect my mother tree if I'm digging around in the roots or should I be waiting until dormancy?

I keep hearing air layer but this doesn't look to be connected to the mother trunk just the roots from what I can tell, I dug about finger deep to see if it has it's own roots when it was just a single leaf sticking out of the soil a few weeks ago, and it does have it's own roots but now it's sprouting up quickly. 

any tips and advice would be appreciated.

I would wound the little trunk about 1 in above the soil and then mound up dirt around it and top with some mulch. Leave it this way until slightly cooler weather. Then it will have even more roots that are very easy to get out. Plus, transplanting this time of year is always a gamble. If  you do decide to transplant now, clip all the leaves in half, then keep in a partial shade for the summer.

is the a good time to transplant in september? i'm just worried about the small plant not being able to establish before the cold weather.

Chris, being that plant is so small,I wouldn't fool with it now,I would carry it over through the Winter after letting it go dormant. Of course, you would winter it along with your others in a garage...

I would advice you to follow GeneDaniels suggestion and wait for the new roots mature first before doing anything.

Hi,
Wait a bit more. In a month or two you can take it away . I always wait for some stem growth before taking them away.
If you don't want to dig in the pot - to hunt for roots-, mound some dirt around the current stem for more roots to appear above the current dirt level. That can only help.

Hey Chris. All of the above and wait until late winter or early spring like big Frank said to transplant. Good luck.

I agree with everyone else

BUT it can be done with risks!

Two weeks ago my Petit Negri had a limb that had established roots in two places. They were both lifted and potted. Both plants were about two feet tall and had a great root system which is the key to sucess. The roots were established all the way around the trunk and were 6" to 9" in lenght with well developed fine hairs. The limb had rooted in well decomposed leaf litter. I removed almost every leaf and today both are doing well. I kept mine in a shady location that is automatically watered four times a day for ten minutes. I potted in Pine Bark Fines. Weather has been low 90's and heat indices in low 100's.

I AM NOT RECOMMENDING THIS ONLY SAYING THAT IT MIGHT BE POSSIBLE UNDER THE RIGHT CIRCUMSTANCES.

I would add soil and bury it a bit, try to get more roots before separating. 

True to everything above, I would point out the added benifit that its still being fed from the parent plant and stands the best chance now of growing tall and fast and you would have a much larger tree next year by letting it grow as much as possible this year.

great info everyone thank you. I was kind of confused on what to do because I read that it is beneficial to the mother tree for it to be removed, so I am I want to keep the baby tree and also help the mother tree. so it seems like it is too soon regardless.