Blue Spruce browning at top
I have about a seven year old Blue Spruce in my yard. It is in full sun. The needles on the tree are a beautiful blue color. Today however, I just noticed that the top leader is turning light green to brown. When I looked at it, the needles appear to be dying from the trunk outward. I noticed that on the top bark of the tree there are little black spots (black spots are not on the needles.) I sprayed it today for spider mites but I was wondering if anyone has any ideas in case it is not mites such as a desease. I am enclosing a picture of the tree but you will not be able to see the black spots but you can see the browning of the top. Any ideas?
Here is a link that might be useful: