Hi everyone,
This is a tree from a cutting I started back in March and it's my only success so far. Everything was going great until about two months ago... then it started to show signs of FMV (well, I think it's FMV. see the upper leaves in the picture.) and growth stopped almost completely. New leaves fall off as soon as they bud out, and those that do make it are small and deformed. And if that's not enough, the old healthy leaves turn brown and yellow and fall off as well. At first I thought the tree lacked nutrition so I added some compost to the soil, but there's no change. I thought maybe it was the strong sun (even though the tree is adjusted to full sun) so I put it inside and still, no change.

So, what's wrong with my tree? 

What is in your soil mix? 

and where are you located at? some of my trees are already starting to drop leaves. the weather here has been rather chilly last week, in upper 70s. where is the tree located at.. what soil mix being used.. water schedule.. and all that might help. also, we asit suddenly introduced to strong sun light?

Make sure drainage is ok, you might be drowning the plant. Also, outside w shade is better than indoors unless it is below freezing (which I doubt).

Poor little thing. I'd be worried too... hope you find out what ails it soon!

Shur,
  All I can say is that you're not alone.  I have a bunch of trees and cuttings that show similar symptoms.  The weather in NJ has gone from too cold to too wet to too hot...first over the course of a couple of months, and now switching ever couple of days it seems.  They've been over watered (due to rain), underwatered (to combat fungus gnats), probably under fertilized, and I'm sure they don't get enough sun.
  So, I'll be watching this thread to note what kind of suggestions you get.
Jim
p.s. you should add your location (or at least your growing zone) to your profile so that the good people of this forum can be pointed in the right direction to help you out.

I think rafaelissimmo nailed it.

I have a Marylane Seedless that looked a lot like that after up potting to 5 gals with a bad soil mix (was too heavy and sandy).  I ended up taking it down to bare roots (dangerous on an already stressed tree) and repotting in a better mix.  After a few weeks, it started perking up.

Thanks for your advice everyone,
I'm using simple potting soil mixed with some compost.
I doubt it's a drainage problem, the tree had been quite happy with the the same soil and watering regime for at least three months before it started to show any signs of distress.
I try not to overwater it. when it was still outside I gave it small doses of water every day. now that it's inside I water it much less, once every few days. I just stick my finger into the soil to make sure it's a little damp.
It's the middle of the summer here (Israel) and I figure there's at least two months before the temps drop low enough for the trees to lose their leaves. So maybe it really is the sun... 

Here's a picture from two months ago, look how healthy it was:

Maybe it is calcium deficiency?

How long ago did you repot it? Did the first signs of stress show up 3 to 5 days after repotting?  I see different pots between the two pics..

Shur, If you use potting soil with compost, the pH level may be acidic and no enough drainage. You should add perlite and lime.

Shur,
I would agree with "jimmychao" abut PH and drainage. I had a similar condition on two (2) different cultivars of healthy looking and actively growing plants that were re-potted to larger containers with a newly mixed batch of 5-1-1 potting mix (the PH was low... acidic). PH being too high or Low will reduce nutrient uptake causing visible signs in the leaves. Good Luck.

Thanks again everyone,
The problems began even before I repotted and added compost (actually, that's why I added compost). I'll see what I can do to improve the drainage since many of you believe that's the problem.