My crepe myrtle loses leaves, then starts growing again, then looks dead, but is not. It has black going half way down limb. What is wrong?
Why Does My Crepe Myrtle Lose Leaves?
Certified GKH Gardening Expert
It is possible that your crepe myrtle has sooty mold. Here is an article or two that you may find helpful: https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/crepe-myrtle-tree-problems.htm