Maybe greasy spot.

Alright, I just hit it with some fungicide, we'll see if that does anything.

I'm near Washington DC and the days have just begun to get shorter and cooler. Do you think it could be edema? I just checked and the the soil is wetter than I usually like to keep it because we are no longer getting the real hot weather that helps it dry out.

Thanks.

Edema only happens indoors.

Even if your tree wasn't producing fruit, they use a lot of nutrients to keep the tree healthy enough to stave off things like fungus and insects. They still need nutrition to build up and maintain their defenses. Just like any other living organism

I'll be sure to keep it better fed in the future if it survives.

How long do you think it would take to start showing a response to the fertilizer? Leaves are still dropping, wondering what I should be trying next. So far I've given it the fertilizer and the fungicide. Still no sign of pests like mites or aphids.

Could you, please, look at my 2 y.o. Meyer Lemon. I have never had this kind of leaves on my other citruses. Lots of small pale green dots. What kind of deficiency is it?

Thanks!

Sorry I don't have enough experience to diagnose visual symptoms. I can only spew the facts I've read about nutrients and disease. The only time I've ever seen leaves look like that is when I looked for spider mite symptoms. They usually leave fine, light colored stippling on leaves. Here's an old thread I found that mentions a lot about it and how to know for sure http://forums.gardenweb.com/discussions/3137974/how-do-i-recognize-spider-mites-webs-from-good-ol-spiders

Oh that reminds me, spider mites infestations will usually occur in very dry conditions so yeah spraying with water is supposed to help. Maybe mulch the top of the soil on the outer edges a bit, to hold in some moisture at soil level to keep the humidity around the plant. If you want to use just water, apparently spraying every couple days with water to knock them off will work. They won't come back once washed off often enough. Let us know what works for you! I haven't gotten spider mites yet and it'll be great to know what I can do if I get them this winter.

Is it safe to spray all of my citrus trees with neem oil to prevent potential mite or other issues?

Yes, do preventive spraying in the evening.

I know it's been two years but I'm curious about the outcome. Did fungicide and/or fertilizer do the trick? Having the same issue now that weather is cooling off.

The good news is that my plant is still alive. I’ve had so much trouble with it over the years, I can’t remember the resolution to this issue here. But generally speaking, I have used fungicide a couple times when I thought there was fungal issues and I have used espoma 2-2-2 fertilizer every month or two to keep feeding it nutrients.

However, almost all problems I have had are related to soil moisture. It’s so easy for the soil moisture to get too high and then suddenly thr plant starts looking like it’s dying and that’s when I realize the roots are too wet and have started to rot. It’s such a fine line. This is critical especially this time of year when the temperatures drop and evaporation decreases. Managing soil moisture has been the most important item for keeping the plant healthy.

Also, don’t underestimate the importance of giving it full sun. there has been a huge difference in plant health between giving it “decent“ sun that I thought was sufficient versus finding a spot where it gets a full day’s worth.

That makes a lot of sense. It's amazing how long it took my meyer to dry out between waterings last winter, which means I was overwatering. And it was inside getting lots of dry air from the furnace. So it was a bit damp a few inches down but somehow also too dry (low humidity)! So many leaves lost during those bleak months. Still pretty thin but it has mostly recovered.

Now I'm putting it out in the sun during the day and bringing it inside since night time temps are in the 40s. Lots and lots of flowers blooming and smelling great. Watching the bees do their work today. Soon it'll move down to my basement - setting up a grow light and humidifier this week. This winter has to be better than last!

Good luck

Hi i was looking thru online posts as i am having same issue. i saw an expert say to someone that it may be skmething called ’greasy spot’ requiring a copper treatment.