Well, without photos, it's just a guess, but it sounds like you tree suffered so much transplant shock, coupled possibly with either not enough water or too much water, it is dying or is dead. Have you checked the roots to see if they are still alive and viable? Can you post photos of your tree and the roots?

Patty S.

I think it is dying

Oh lord! That is a sad tree :-( is it grafted? And if so has it died back past the graft line?

When my meyer lemon started dying back I consulted the nursery that I bought it from. With their advice and my effort I brought the tree back from the brink. Since this looks like an emergency I am going to copy and paste the material here for you. The rest of my post will be taken from the tips and advice section on Four Winds Nursery's website:

Leaf drop and twig dieback can be caused by lack of light. Citrus trees need a minimum of 6 hours of full sun to grow. If growing indoors, it's possible that your trees will do better with a grow light for the winter. A sudden change in lighting or humidity can cause problems, so be sure to move your tree gradually from one spot to another, or from inside to out.

If your tree receives adequate light, and experiences leaf drop, improper watering is probably the culprit. A lack of water can cause the tree to dry out and lose leaves, while excessive watering can cause the roots to rot, so that they lose the ability to take water and nutrients up to the leaves. If you modify watering to provide even moisture, often the tree will recover, albeit slowly. A moisture meter is useful to be certain that watering is necessary, and can help you develop an appropriate watering schedule.

Should your tree lose all its leaves, don't despair. You can prune it back lightly to help push new growth; then, with improved growing conditions (adequate light, correct watering) it should recover. Remember also to feed regularly with a good citrus fertilizer (3:1:1 ratio or similar).

Check your tree regularly for pests. Severe infestations of scale insects, or mites can cause defoliation. Regular monitoring will help you to take action in time, before severe stress (defoliation) occurs.