Kind of looks like the tree has a case of aphids also, which is helping to attract the lady bugs. Just doesn't look good. My first thought when I saw the leaves was severe root rot, you might even be able to lift the tree out of the soil--doubt there are many roots left. Might be better to get rid of the tree--looks like a goner anyway, eliminate the scale and aphids from all the plants around the area, then get another tree.

Stanley, you don't say where you live, which helps, but it appears to me to be gummosis (phytophthora). If you Google "gummosis citrus", you'll come up with several link for treatment. I've provided one below for you. Patty S. Here is a link that might be useful: UC IPM: CItrus Gummosis

For citrus groves, the eulophid wasp is pretty effective in controlling peelminer. Since there are several wasp species in Florida that do the same for leaf miner, I imagine there would be some possible cross-parasitism. Unfortunately, cultivating wasps is out of the question for backyard hobbyists. It's my opinion that the benefit of neem oil is more preventative, in keeping the adult form from even landing on a tree that's been sprayed. That because of the smell, more than anything else. There's probably a pesticidal benefit for insects the oil contacts as well, but when I spray, I'm not especially concerned with getting the oil on all parts of new flushes. This is why I think that neem will be an effect deterrent in both cases. Peelminer adults lay eggs on the bottom sides of leaves (allowing them to be sheltered from large-scale pesticidal applications), but leaf miner behaves similarly. I can eliminate leaf miner by spraying the top sides of leaves. So, it stands to reason that the effects of neem oil would be similar for both moth species. Moths have highly-developed senses of smell. -Bruce

It could still be deficient in Macro/Micro nutrients. Have you checked the pH of your soil? If the pH is too High or too low, it can affect nutrient absorption. You can give it lots of micronutrients but it may be too difficult for the roots to take up the nutrients if the pH is out of wack. Another thing it could be is overwatering. You should let potted citrus dry out slightly before the next watering otherwise you can encourage root rot. Next time, before you water your citrus, tip the pot on its side and check the drainage holes and feel if the soil on the bottom is wet. If its still wet, do not water. Your plants actually look pretty healthy to me but I do notice that in the pictures you posted that they are in some shade. citrus loves sunlight and you should put them in the sunniest location you can find. There is lots of talk in the citrus forum about Gritty Mix and 5-1-1 mix. I believe these are mixes that are fast draining and can be beneficial to citrus. There is a good chance that your trees are simply dropping old leaves before new ones come in. Please keep us updated. Simon