Q.Myrtle
My myrtle is dying. Why? I’ve had it for years.
These articles cover some of the issues of disease or pests that Crepe Myrtle can be infected with.
https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/crepe-myrtle-care.htm
https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/crepe-myrtle-tree-problems.htm
https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/crepe-myrtle-bark-scale.htm
https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/crepe-myrtle-tip-blight.htm
https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/fix-crepe-myrtle-knots.htm