Same here, Lucky....some of our adult trees are just skeletons. Over the years we have cut most of the hard wood and left only the hemlocks because we like them. We've pruned the smaller ones so that they get very thick like shrubs and make great privacy. I don't see any sign of insects. I'll keep you posted if I can find out what the problem is.
Thanks, everyone for the suggestions....I'll follow them up.
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