Ficus Nitida (Indian Laurel) Dying

[MethodAgent]

Hi all, I have about 20 Ficus Nitida (Indian Laurel) trees in my backyard. 6 of them on one side of the yard seem like they are dying. They are 5 years old. They are 1 hour of irrigation on a drip system 3 times a week, but do get less sun than the trees on the other side of our yard. The pool man is not dumping chemicals in the area. I have attached pictures of the problem. The trees are getting pretty sparse in comparison to how they were and the leaves look sick. We have tried spraying copper fungicide on them over the past few weeks and increased watering. This has been going on for about 6 weeks. Any ideas would be greatly appreciated!

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