Answer: My research shows that citrus trees typically remain productive for about 50 years so your tree is middle aged. I do think that removing the 2 trees that shaded the citrus changed the growing environment and quite likely stressed the tree. Additional sunlight could burn the leaves that were used to shadier conditions, but also the soil moisture content may have changed, as well. Without the two large trees drinking up moisture, the soil may have become too moist for the tree roots. You wouldn't know without digging down a few feet - nothing that I would recommend, mainly because there wouldn't be much that you could do about it. At this point I would treat the tree as you have in the past; regular watering, but no pruning and no feeding - until you see new growth. Let's hope for the best!
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