Dying Arborvitae - z7
I need help determining what is happening to my arborvitae. I planted two about a year and half ago and one is doing fine. Both were until about a month ago. They have received plenty of rain lately and I have watered each the same during droughts. I added liquid fertilizer when I first noticed the brownness and have also sprayed for mites but nothing has improved. I am attaching a photograph and would appreciate any help.
Thanks in advance