The leaf drop might be due to shock. A few things you can do for the fungus gnats is to sprinkle mosquito bits on the soil and water it in when you water. Then cover the soil with a layer of food grade diatomaceous earth. The diatomaceous earth kills the flies, the bits kill the larvae. Then water as you normally would.

Thank you @Ken B Zone 7 and @bonsai_citrus_and_indoor_gardening

Do either of you know how long I'm going to be seeing the effects of the shock of being brought inside? It's been a few weeks now and I have consistent leaf drop each day.

Any suggestions on clipping the blooms in order to redirect the energy to the fruit?

Thanks again!

A few questions. What color are the fruits that have kept on the tree? And when you say that you're letting it dry out, how dry are you letting it get? How long do you have it under the lights every day/how far away from the foliage is the light?

@bonsai_citrus_and_indoor_gardening See photos. Some other info:

I accidentally over fed the tree mid-summer with citra-tone but it's my understanding that since citra-tone is all organic, it's harmless to "overfeed" and we didn't get any fruit or flowers until I did that.

The grow bulbs are pretty weak so we have them kind of close.

I had some leaves with eggs underneath in mid summer but i plucked them and some munchers (worms in the curl of leaves, idk what they're called) in the leaves but again, got rid of them. Haven't seen any of either pest since.

before i took the tree in, it rained a lot so the soil was pretty soaked so I haven't watered it since and it still looks like there's moisture in it soil. I'm also pretty sure the fungus gnats are a consequence of bringing it in while it was so wet.

Thank you so much for your help! Also included a picture of the one lemon that came from the single february bloom, it's huge and super healthy and we didn't harvest it until this week so I don't think the tree is totally failing.

1. Single lemon that started in March after a single Feb bloom

2. Current moisture situation. Meter is about 3-4 inches deep

3. current lemons and blooms. Lemons are about an inch long

4. Grow bulb positions, there is a large window adjacent to this corner but doesn't get a whole lot of direct light through it due to the neighbor's house being about 10 ft across from it.

If it's only just now drying out, that may be a source of the leaf drop, and it should slow as your moisture levels return to normal. If the fruits are staying green and growing, then I wouldn't think that the tree is in too dire straits. It just looks a little overwatered to me. Fungus gnats aren't always due to overwatering. In some environments (especially where they are prolific outdoors. In other words if you walk through clouds of them in autumn outside), they'll find their way indoors and if they happen to come in on watering day you might still deal with them. I've found the mosquito bits and diatomaceous earth to be fairly effective. How long do you leave your lights on every day?

@bonsai_citrus_and_indoor_gardening got it! I'll let her dry out a bit. :) I did purchase the items you suggested so I'll be doing that today. Do you have a recommendation for how to apply the bits? I saw something that suggests letting them soak in water first.

As for light I believe the timer is 7AM to 9PM.

Thanks again!!

I wouldn't let it get bone dry, just water as normal when it dries out. As for the mosquito bits, my bottle says to sprinkle them on the soil and water them in, which is what I've been doing. You just make sure there's a thin layer on the whole surface of the pot. I haven't tried soaking in water and watering. I would imagine that would be easier for smaller plants, but for citrus it seems to work well just sprinkled on the soil.