This time of year a soil drench application should be done. You will quickly notice that the scale is dying and your tree will begin to recover. Crepe myrtle scale has been @ epidemic levels for several years now.
Drench the soil between the tree’s drip line and the trunk, using a systemic insecticide such as Bayer Advanced Garden Tree and Shrub Insect Control, Bonide Annual Tree and Shrub Insect Control, or Greenlight Tree and Shrub Insect Control. This treatment works best between May and July; however, it may take several weeks for the substance to make its way throughout the tree.
This time of year a soil drench treatment is warranted
Drench the soil between the tree’s drip line and the trunk, using a systemic insecticide such as Bayer Advanced Garden Tree and Shrub Insect Control, Bonide Annual Tree and Shrub Insect Control, or Greenlight Tree and Shrub Insect Control. This treatment works best between May and July; however, it may take several weeks for the substance to make its way throughout the tree.
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https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/crepe-myrtle-tree-problems.htm
I'm sorry to hear that and it must be frustrating. Here is an article that might help you - https://www.southernliving.com/garden/grumpy-gardener/why-wont-my-crepe-myrtle-bloom
It may have crepe myrtle scale. Are the branches black?
This time of year a soil drench treatment is warranted
Drench the soil between the tree’s drip line and the trunk, using a systemic insecticide such as Bayer Advanced Garden Tree and Shrub Insect Control, Bonide Annual Tree and Shrub Insect Control, or Greenlight Tree and Shrub Insect Control. This treatment works best between May and July; however, it may take several weeks for the substance to make its way throughout the tree.
Read more at Gardening Know How: White Scale On Crepe Myrtles – How To Treat Crepe Myrtle Bark Scale https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/crepe-myrtle-bark-scale.htm