Crepe Myrtle disease, moldy look all over leaves.

Question

Old established trees. Cut back most years. Not much flowering. Should I treat or cut down about six trees in a row.

Answer 1

It sounds like it has powdery mildew. This article will help:
https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm