First, let me ask you this: When you transplant did you remove most of the soil from the roots? If you did, your citrus is just showing you her displeasure. You got her stressed out. Or else you got a Meyer lemon. The basics when you transplant are not to disturb the roots as much as you can. You get a sharp long knife and dig it all the way through the bottom around te edges and if it is small enough tilt it sideways and pull it out. Then carefully put it in the new pot and plant it the same level as the original soil. Then, soak it, I mean soak the soil until no bubbles comes out of the soil. Then put it the shade for 3 days or more until you see the leaves perk up again. If you did right the plant will not even know she was moved and her leaves will stay turgid and pretty. Then you don't even have to put it in the shade. Since your tree lost all its leaves, my suggestion to you is just put it in a place where ther is no direct sunlight and cover it with clear plastic to retain the moisture. If I were you I'd throw that moisture meter in the garbage can beause a lot of people here were deceived by those meters and lost their plants. I was one of them. I felt good when I threw mine as far away as I can in my neighbors, yard. Just water with your gut feeling. If you think that it needs water, water it. Wait until a first inch of your soil is dry first. Don't wait until the leaves wilt. Once you put your plant in a safe place forget it. Check after 5 days or so and wait for the signs of new buds coming out. That's when you fertilze it with 1/4 the recommended dose of fertilizer I use the miracid by miracle grow fert the rodo/camelia kind for acid loving pllants. Then put your plant little by little to sunlight and to artificial light. I think you still can save your plant. Just semineglect it for now and don't move it too much.

Rob, I think a few of us in this thread have some reasonable experience with citrus. I'm a Master Gardener, and have been growing citrus and other fruit trees for a while, now. I have over 50 different varieties of citrus, and about 60 total citrus trees on my property. I do citrus presentations for my CRFG chapter, have attended UC extension classes on citrus, and am always learning. I also have a background in science (Biology). John has a degree in Botany from UC Davis, and is developing a large commercial citrus business. Neither of us are experts, be we know a few things :-) Perhaps you have more education, experience, expertise than us. We would appreciate your comments. The problem from what we can see with the photos, is the extent of the rootstock growth. That trunk emanating from the rootstock looks quite substantial. Cutting it off may cause a narrow crotch issue where the rootstock and scion are joined, which over time will eventually weaken the scion where it attaches to the rootstock, and may end up being the demise of the tree. Will the scion grow if the rootstock growth is removed? Most likely. But, will that provide a sound tree that can grow in the most healthy shape and manner? That's questionable. Again, just based on the few photos we have, this was several or our concerns. We really don't have enough photos to make the very best determination, and shambu is going to see if he can get the scion to recover and grow in a healthy manner, so time will tell. Patty S.

If it were my tree... I would dig it up and get rid of all the old compacted soil around the root ball. I would make sure the roots are nice and loose. And dig a big hole and mix up some soil and amend, mulch heavily. the point is the roots need attention. Make sure the soil drains well...

I’ve had this tree for about a month and a half now. Various issues have come up. A few weeks ago I filled the top of the pot with some extra soil as it was knocked over and a bunch fell out - at the same time I gave it a citrus fertilizer spike and then about a week after I put both in I noticed there was a layer of Mold on the soil. I removed the soil and talked to the plant store and they said it was most likely caused by overwatering, so I topped up the soil again. Not sure if it was overeating or maybe caused by the fertilizer? About a week after more Mold has appeared on top of soil, so today I sprayed with a hydrogen peroxide and water mixture which the plant store suggested. Along with this issue,some of the oranges have developed brown spots and don’t seem firm. 1 actually fell off and looked rotted on part of the inside. AND I am seeing a slight powdery stuff on some of the leaves. Overall I’m just in over my head with the amount of different issues and would love some help!!