One of my pine trees is dying and I'm hoping someone can tell me if I can save it. It is one of nine trees all in a row and probably 15' tall. I've had it for about 10 years since it was about 4' tall. In the fall I noticed the lower branches were turning brown. Now it is most of the tree except the very top, and that part is less green than the other trees. All the other trees are very healthy looking. I've attached a picture. Not sure what I can do. I'm in WI so it's just getting warm now.