leaves falling off my crepe myrtles

Question

The leaves are falling off my crepe myrtles at an alarming rate. Are they under stress?

Answer 1

This could be Cercospora leaf spot.
I would rake up the fallen leaves and dispose of.

Here is a link.

http://www.clemson.edu/extension/horticulture/landscape_ornamentals/crapemyrtle/culture/pests_cercospora.pdf