I purchased a green ischia tree from Just Fruit and Exotics back in March and it has been doing really well up until a couple of weeks ago. Started seeing a few leaves with small spots on them. The number of spots is growing as is the number of leaves affected. Also some of the leaves are starting to brown at the edges. We are having very high temperatures here in the Phoenix AZ area (about 115 degrees) with no let up in sight. I've moved the tree from full sun to shade to give it some relief. I dont think the heat is what caused the spots though, as they were present before the heat cranked up. Two other fig trees planted in same location, same medium, in same pots, getting same drip irrigation are getting stressed by the heat, but no spots.

Any suggestions as to what this is and what to do about it?

     

The older leafs on mine have done the same thing, and we went from the 70's to the 90's.  It seems to me that it is just a little bit of shock, the new leafs on mine are adjusted and showing no issues.  Sun burn perhaps.

Try putting in partial shade for now. No saving the crisped leaves though. Fertilize for new growth. I have the same variety also from JFE. It is a late ripener I find.

theres fig trees at walmart here for 16 dollars they have green ischia black mission and celeste there pretty god sized with multiple branches very bushy