I second that!
Being in the business of trees, I have used the UNH Cooperative extension offices many times in order to gain answers to the unexplained.
I have taken down better then a hundred of these declining hemlocks in the recent years. I have been able to find the reason for each of their demise. Sometimes it is as simple as soil compaction or construction stress or as complex as changes in soil hydrology or insect infestation.
One important thing to note: If the trees you are thinking are dead are in a location that has limited equipment access, it is important to get someone to look at them sooner rather then later. Once the trees are to compromised to climb safely (if need be), the job only gets harder.
Reguardless, the county forester is a great source of information. The Belknap county forester is Andy Fast and he is based out of Laconia.
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