Im a forester, yet i live here in the south and am better at forest pests vs ornamentals trees and pests. But first look with out reasearching is tip moths, yet they usually dont kill a tre just the top and cause multiple leaders to then grow. Not sure i can tell the pine or not, is that virginia pine or white pine? Lokking at the bark i would have to say white pine, but the branhing dosent look right. This must be a more norhtern species we dont have here , red pine with out looking i have no idea what this looks like.
I would say those find out what those casings are from and you have your answer. Spray the tree with an insecticied as well as the others to try and save it. Go to , i think, bugwood.net or maybe org. Its the forest service site and there are many pics of pests and damage they create. I dont have time now as im at work.