The answer to your question is: “if it was my tree, I would be concerned.” There appears to possibly be a couple of things going on here: 1 – the black areas on the leaves could be a sign of a fungal leaf disease or a nutrient issue and 2 – the discoloration of the leaves are most likely a result of a nutrient deficiency. For a more positive ID on both, we would suggest taking a bagged sample into your local garden center and/or you local Cooperative Extension office. These links might be helpful:
http://www.ipm.ucdavis.edu/PMG/GARDEN/FRUIT/citrus.html
http://www.ipm.ucdavis.edu/PMG/C107/m107bpleaftwigdis.html
http://www.ipm.ucdavis.edu/PMG/GARDEN/FRUIT/ENVIRON/mineraldef.html
Regarding the fertilization issue, we strongly suggest investing in a good quality fertilizer specifically formulated for Citrus and follow the directions on the container. Your local garden center should be able to make suggestions. Make sure that it includes micronutrients.
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