evergreen is brown almost, mostly on the top, and working its way down?
Colorado blue spruce I believe they are, I have 2 right next to each other, they are over 10 years old, one is turning brown from the top down to the bottom? I don't seem to see any bugs, and my other tree seems green as green?
What you are describing is similar to drought stress, a common problem with blue spruce trees in Wyoming. But, without seeing the trees I am just making an educated guess. Is it possible for you to upload some photos of the trees? Also, how do you water the trees? Thank you. I just need a little more information before I can help your tree.