We have a hedge row of this Aborvitae around 6 or 7 years old. Late last Summer one started getting brown pretty quickly. Checked for water or lake of with a gauge, sprayed and fertilized them. A similar issue happened on the one to the left of the brown dying one. That was 3 summers ago. I sprayed them and fertilized them and cut away all the dead branches and stalks. I would say 70% of the plant was dead. To my amazement it came back strong. Almost catching up to the other plants. I am not sure that it is the same thing but looks similar. This time the spraying had no effect. Moisture checked out too. Only one little part of the plant is green as you can see. My concern is what is the cause and how to stop from spreading to the other plants. Please advise me the best way to go from here. Looks like I may have to remove it.