Check for small pests like spider mite and treat accordingly.

When the flowers form fruits you will need to break most of them off. Keep your best 2 or 3. If your soil is dry you will need to soak the entire pot in a tub for about an hour to get rid of dry spots that are hydrophobic. I flood each one of my trees about 1 a month and top water 1 or 2 times between each flooding. I also spray my trees with an oil soap solution weekly when I have new growth but once a month with just old growth. most people use Neem oil in this group, but because my wife is a hoarder I can only find Canola oil and dawn dish soap. 4 Tablespoons of oil, 1 tablespoon soap to 1 gallon of water. works wonders and is cheaper than Neem or insecticidal soap. Are you in zone 11 growing area. if not you can sign similarly to me so others know more on how to help you.

I was really hoping that some Meyer specialist would have commented. My Meyer expertise is to not grow them because the are the second hardest citrus to grow in pots.

6b Steve

I'm 6A. I checked for spider mites or any other pests but I wasn't able to find any. Perhaps they found a new home. I do have neem oil that I can try just to be safe

Oh wow that's some serious light concentration. Didn't realize how much it needed. My plant is certainly nowhere close to getting as much concentrated light as yours is. This is my first year growing such plants inside.

I'll see what I can rig up with some mylar blankets that I have and also use some of my neem oil to be safe.

Thanks!

Do you fertilize a lot?

I've decreased the amount I fertilize it since I brought it indoors. I wouldn't say I fertilize it a lot. Here's some maybe slightly better pictures of the spots

Since you don't see any pests, maybe it could be a fungal disease, such as anthracnose. You could apply a broad spectrum fungicide.

I have some liquid copper, think that would do the trick? I suppose it couldn't hurt the plant

Any update?

Not really. Well the leaf drop problem has slowed down I guess, but the spots on the leaves keeps spreading and getting worse. I removed the worst looking leaves and sprayed with copper. I'll spray it weekly and see if that prevents more spreading of whatever it is. I'm also giving it more concentrated light

Looks to me like the damaged leaves were caused by something that was sprayed on the tree. Leaf drop may be Winter Leaf Drop. This might be helpful: http://www.steffenreichel.homepage.t-online.de/Citrus/lime2.pdf

That is a very helpful link, thank you. As for the damaged leaves, I really havent sprayed anything on them besides water. I did spray the leaves with iron chelate many months ago but I really cant think of anything else that may have even just accidentally sprayed on it. Especially since it's been indoors for a couple months. Unless I didn't clean the windex bottle enough before I sprayed with water. But I can't imagine a trace amount of windex would be that harmful to a plant

Thanks for the link Vladimir. I have one tree that is suffering the most - Alexander. He looks rather pathetic. I think it may be the aggressive treatment for spider mites in my case. I suspect it hurt the leaves. I just wanted to nip them in the bud but may have been a bit overzealous. They ARE gone though...

Here's a typical leaf from him that just fell.

My trees dropped most of leaves too.

Meyer lemon trees should be grown outside in ground. They are so productive that you could keep a 5 foot tree and protect it easily down to zone 7. Since only a very small covering is needed you could get and heat a glass covering very cheaply.

6b Steve

Let me ask please?..Do you FLUSH that mix out once every two weeks or so even in winter?

When my trees leaves use to look like that, it was damage due to tap water with too much chloride and salts...Then the rest of the damage came from salt residue from fertilizers...That looks just like root damage due to too many chemicals held up in your mix ...Those leaves should grow much better than that.

Does your tap water hold too much 'calcium and magnesium sulfate'? Those white spots were from magnesium sulfates in my water..

This is the very reason why I look using the very porous mixes or rain water..Prevents all these issues systemic wise...Except of course the leaves if you should spray them down with tap water and let the water droplets dry off., topically that can happen. Have you or do you spray your leaves with water or mist?

I spray my leaves with tap water. Haven't gone out to fetch some snow to melt it. I can try it though. I've watered other plants with my water and they've all seemed to be fine. I'll also try snow water to see what happens. I have no idea what is in my tap water

Drew, just because your other plants are fine does not mean they will stay that way if you are using the same mix that decomposes like that. You may still have time on others and or may get caught off guard..

Typically, in order to be successful at least a little bit with finer mixes , you would have to re pot every 6 months or less and only pot up in one size. Flushing this kind of mix is a must of any accumulated salts...

What kind of other trees or plants do you have and what are they planted in?

How are the leaf margins and or very tips of them? I'd bet if you had a palm tree growing in that kind of mix watered that way, the fronds would be all black tips or yellow...How are your other plants leaves, the tips? Are they flawless?

If you tap water has magnesium sulfate in it at higher levels, then it can leave white reside as spots behind...Too much of it and other chemicals can also contort the leaves.

The soil for all my plants is a little different. For my lemon I believe I used some sort of ratio of pine bark and perlite and some compost. I mixed in some osmocote and also watered occasionally with dynagro. I do the same for my banana plant. Makes me wonder if I actually did maybe overdo it with the fertilizer since it was moved inside. The tips of the leaves seem fine to me on most leaves

Also i just noticed that perhaps I have a fungus gnat problem. I had a few but I read that they were relatively harmless and would go away if I didn't overwater. But I definitely dont think over water. I threw some sticky traps up and caught more than I expected.

Sorry I'm all over the place. This is my first citrus experience and also my first time having a plant outside and then moving it inside