Question
I have 2 non fruit bearing mulberry trees. normally from spring all through fall they have full leaves. This year for some reason from the middle of the tree up to the top of the tree the leave look as though they have been literally burnt from a fire. The bottom leaves are nice and green. We live in a hot climate and that has never affected the trees before. Any idea what might be going on with them.

Answer
Sounds like there is something going on with those branches.  Observe them closely for any wounds or holes that may attract insects.  If possible, also look at the leaves themselves to see if there are insects or maybe a fungus on the them.  I would imagine the problem is in the base of those branches.  Let me know your observations.  Thanks.