Q.boring pest in crepe myrtles
I have some sort of boring pest in crepe myrtles. They bore in and the sap comes out and runs down the trunk. The trees appear to be dying and they haven’t budded out this spring, just trunk. What can I spray them with to get rid of this pest?

Do you have a photo of the borer insect? I know that the Asian ambrosia beetle is known to bore into crepe myrtle trees:
http://extension.entm.purdue.edu/CAPS/pestInfo/granulateAmbrosia.htm
In the meantime, here is an article on tree borer management:
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-borer-insects.htm