My tree was fine and got the usual leaves. It is over 50 years old and huge. Suddenly the green leaves are falling this summer. We did go through a 5 year drought. What can I do.
Mulberry Trees can drop leaves if they are stressed; drought would certainly fall into that reason. Heavy rains or wet soil also can be a reason for leaf drop.
Watch for other signs of issues; pests, leaf markings etc.