I have slowly been watching my lime tree die. I thought it just didn't get enough water last winter when we had no rain in the Los Angeles area and had heat problems. I noticed the bark seemed damaged so I painted the side that got the hot west sun. We have clay soil and I planted it too close to the garage expecting it to be a dwarf and much smaller. It had really small limes this year, but almost no new growth or leaves. The branches seem dead. I wonder if this tree looks like it can be saved? We are in the area for these Asian citrus psyllid, but I never saw them on the tree or damage in fruit. I have an orange and lemon tree both doing fine. Should I just take it out, or wait and see if there are new leaves?
Clay and salty soils are not suitable environments to grow a citrus. You can trench an area near the tree at least a foot deep back fill with rock and cover with soil. Ideally you will trench downhill letting the soil drain. Your tree probably encountered Phytophthora which is a fungus that can be treated in the spring with an antifungal. You will need to remove infected branches.