I'm in Southern Ontario, in zone 5-6. A client of mine has a mature Emerald Cedar on the front lawn. It has been healthy and shown no signs of decline, until recently - I noticed that the tips have begun to turn brown - about 2 to 3 inches up the stem - not all the stems but enough to notice. I examined the tips but couldn't actually see any pest, so am wondering what to do. the lady wants me to prune out any brown, but I want to find out what others think the problem might be before embarking on that route.. Suggestions would be welcome.