Maple issue with leaf burn or something else (maybe fungus)

Guys,

This has been going on since spring. All of my maples (Silver, Red and Autumn Blaze) have been going through this since spring. I have added iron to the ground (Pelletized), fertilized and then I removed the grass around each's base and mulched. I do have some new growth that has stayed relatively healthy but as you can see the majority of the leaves are not heathy. I have also been supplementing them with water during the extend dry days lately.