Zone 6 gardens have to take a different approach to crapemyrtles than gardeners further south. The late snows and warm/cold spells took a toll on them this spring. The weather sent mixed signals as to when to wake up and grow and when to go back to sleep. In a zone 6 garden, you have to be patient with pruning out the winter dieback. Give the crapemyrtle a chance to slowly wake up and start putting on new growth. Then, working around the new branches, clean up the winter kill. This year, I held off on pruning until late May. I had to wait until the crapemyrtles were ready.
Thanks for writing!