Hello,
I had 3 sycamores planted last fall. All three came to life wonderfully this spring and were doing great up until this week. Now the leaves of one of them are turning yellow with something of a mottled appearance. There are still plenty of green leaves but this came on quickly. Nothing particularly different about the location of this tree compared with the others. They all get about the same sun and water. The affected one has a monkey flower bush closer to it that is probably best but there isn't any sunlight competition.
This is San Diego. Not the coastal climate region but the one just in from that.
Thoughts?
And before you chime in John the mulch is about a foot from the trunk and it was planted by professionals at the proper depth.
thanks ml