Did I overwater my Ash trees or did the heat get to them? (Phx. 115 degrees) The leaves curl, brown then drop?

Question:

Answers:
Summer leaf drop is common for Ash trees. Anthracnose, a fungal disease that often affect Ash, can cause a tree to lose up to 50 per cent of its leaves. The leaves should grow back within three to five weeks. The disease is not a danger to people or animals and does not affect other types of trees.

Rake up the dropped leaves and burn, or dispose of off your property.