KC, I would cut the dark branches. I wish someone chimed in with real life experience about this and tell you how to solve the problem. You could also do research on it on YouTube.

Thanks, sunshine! Will try and prune them off, but worried about more open areas for the fungus to affect!

If there's something wrong in your soil, in your other post PacNor was talking about a soil drench. How old is your tree, when did you put it in ground and when did you notice that dark ring on the trunk of the tree ( any before pics?)

Sunshine, it's been in the ground 4 years, and has always been darker at the base. The darker branches are newer, in the past year. The whole plant looks unhappy now. I'm away from home for a week, I'll go back and see how it's doing. Sigh, it was doing so well till now!

Will do, John.

Is this a grafted tree.

KC, you did the right thing by cutting the oozing branches and areas. I would drench with a light Agri-Fos solution and watch it closely.

The bottom dark area looks like parts of / and similar to issues with the plants on failed Cuban Shaddock rootstocks that I have had. I always thought it was latent freeze damage, but could never really be sure.

Do you know what rootstock that is? Any chance that it is Cuban Shaddock?- - - - George

Steve, no idea! George, thanks! I know nothing about the tree, sadly. I think it has an aluminum tag with a handwritten name on it, Mexican sweet lime.
So, how does one do a soil drench? I'll order the agri-for to be delivered for when I get back, and give the area around all the trees a treatment.
Meanwhile, spent a day at the New York Botanical Gardens. How easy it is to grow things when you have enough water! That said, I don't deal with snow, so I guess that evens things out.
KC

yes, its different when you have plenty of water isn't it!.

How I perform a soil drench for my in-ground citrus: [if I suspect a potted plant is suffering, - or - had an issue with overly wet conditions for whatever reason, I just add the AF to the usual water - ]

1) water the root zone thoroughly

2) mix up a few gallons of Agri-Fos solution (probably 2 gallons more than plenty - - depending on where you think the roots are) [I mix it at 1/2 to 3/4 Tbs. to gallon ratio]

3) pour the mixed solution onto the root zone

4) repeat in 2-3 weeks

Ok, I think I got that! Thanks, George. Mix in a bucket, pour with a watering can over all the ground under the tree! Problem might be getting it around the Meyer lemon, which has so many fruit laden branches almost at ground level. I was going to clear the lowest branches after picking the lemons. I can't wet the ground without wetting the lowest branches. And I don't want to cut the lower branches while a fungus is on the hunt :)
KC