Is that planted in the ground and for how long?

It should be full of new growth and very full. It tells me that the currant fertilizer you are using is not doing what it should. In fact, your tree should be almost bug proof if it were very healthy...

It is planted in the ground. For one full year. Did the same blossom and die back last year, too. I agree. It should be showing a lot stronger growth. Will get citrus fertilizer. Now looking at the lime tree. It, too, has dropped it's fruit. Ugh

Leafnose, is that a cement wall that your trees are planted close to??

Here's why............. Take a good read and tell me if you think this is affecting your trees?

I landscaped for years and one thing we would never do is plant anything that required a lower pH soil near concrete. It can inhibit nutrient up take and cause many issues..Gardenia for one should never be planted along concrete and neither azalea or any other acid loving plant. and citrus is no exception unless you consistently add an acifier of some sort

Concrete is alkaline in nature, meaning it has a pH of 7.0 or above. It gets its high pH from several ingredients containing calcium. One ingredient is limestone, which is made up of calcium carbonate and is commonly used by home gardeners in a finely ground powder form, called lime, to raise the pH of overly acidic soils. Concrete, or cement, can affect soil pH when acidic rain or irrigation water falls on a concrete sidewalk, driveway, or building foundation and sheds onto adjacent soil. Over time, the water leaches calcium carbonate out of the concrete and into the soil, resulting in soil near the concrete structure having a higher pH.

The pH of soil determines a nutrient’s ability to travel through the soil and be taken up by a plant. Plants have specific soil pH ranges they prefer. If the soil pH is outside the plant’s preferred range, it can’t take up the nutrient, even if it is available in the soil, and the plant becomes deficient in that particular nutrient. Depending on the lacking nutrient the plant can suffer stunted growth, foliage discoloration, or in very extreme cases, death. To know if the soil near your concrete is affecting planting soil, perform a soil sample that checks for pH. Acid loving plants prefer a pH of 5.0 to 5.5, ornamental plants and lawn grasses like a pH of between 5.8 to 6.5, as do vegetable plants. Also, water garden plants like a pH between 6.2 to 7.4. Over time, calcium carbonate leaching from a concrete water garden pond can raise water pH to above 7.5.

Plant Gardenia (Gardenia jasminoides), which grows in U.S. Department of Agriculture plant hardiness zones 8 to 11, near a concrete walkway or concrete foundation and you could see this acid-loving plant’s foliage turn yellow. This shrub likes soil with a pH between 5.0 to 6.0. When soil pH rises, gardenia suffers iron chlorosi: an iron deficiency that causes yellowing of leaves. Correct this problem by adding sulfur to the soil to lower the pH to the target range. Add the amount recommended on the label. This fix is only temporary. As long as calcium carbonate continues to leach from concrete into the soil, pH will rise when the sulfur effects wear off. For a permanent solution, either relocate the shrub to an acidic soil away from the concrete, or remove the concrete structure.

it's not out of the realm that the stucco wall is to blame. It is a wood frame lathe with stucco over the top. Almost a hundred years old, so leaching should be lower, but something is going on there.

Mike has given you some very good advice. Citrus will grow in almost any kind of soil; but it will NOT grow in calcareous soils; and calcareous soil is often artificially created during or after construction with concrete.

I wouldn't worry about it, it's just a covered wood frame and not an actual concrete wall. So logically there is no stucco underground.