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Can't really say for sure, but over watering can cause citrus leaves to curl up. So can heat stress. If your plants are growing in a mucky, poorly drained potting mix that is lacking in porosity, that could be the problem. The less porous the potting mix, the harder it is for the roots to access plenty of oxygen in order to constantly make new roots. It's the root hairs on the tips of the new roots that absorb water. Not being able to get enough moisture now that temperatures are heating up might cause the curling.

Avi, leaf color is a mottled..check for spider mites. Inspect all parts of citrus. Look for webbing..
You can also stick a white sheet of paper under leaves, tapping them while holding sheet of paper underneath. If there are mites, they will fall on paper, you'll see those little buggers on paper..they come in various colors..they move around, slowly..you may need a magnifying glass to spot them...Let us know what you discover..Toni

Your tree looks quite healthy, however as stated above, the micro spotting of the leaves could possibly be from spider mites. A spray of 1 percent horticultural oil in water works extremely well. Also a 1 percent soap solution in water works, but will probably take repeated applications. In either case, spray early in the day or late in the afternoon. However, be sure to check if the tree indeed has spider mites before any action is taken.

Hi all,
I checked my tree with the white sheet of paper. I have pretty good eyesight and only saw one little thing moving around on there. I did shake the majority of the tree. Is this one little bug requiring action? Is it like having roaches? If there is one there are a million more you haven't seen? I am afraid to do anything to the tree, but in all reality I have lost all but 2 fruit. They all turned black and fell off after looking very promising.
So, to treat or not?

Avi, sorry I couldn't offer help w/that black stuff on your tree..
If it was my tree, I'd check w/the white paper every other day, just to be sure.
If you see more of these 'bugs?' then it's best taking action..
They are difficult seeing considering they're less than 1/25 of an inch..That's tiny..some people can't see them period. Toni