I'm trying to rule out install error since the same guy did them all and there seems to be a pattern in the death (high to low on the hill) so I don't think it's something that came from the nursery either.
What do leaf miners look like?
The homeowner is a haggler, maybe he just wants something for nothing. He added the stone after. And has been hand watering. No drip to the area (what I told him to do)
Not much rain lately and July was hot.
These were B and B trees FYI.
Thanks for the help people