Can you help me troubleshoot my dying hedges?

Hi Mary. They are either not getting enough light or have been planted too deep.

They could also be overwatered or have sat in a wet area for too long.

Their days are numbered.

1) drought, 2) someone poisoned them 3) a brush-killer/ivy killer was used too close to them.

i have quarterly treatments from Terminix on the outside of the house fir bug etc. could that be the culprit? i am really sadden my cratemrytle? is dying from the bottom and it is huge.Is there anything i can do ?Been putting stakes in the ground around them .some are showing improvement but again only on the too.They ate all in full sun.