Thanks for the link -- I didn't realize quickly that you can actually buy these, tho they might only sell large amounts. Told my brother to inquire about it.

Funny with the girth of the trunk and width of the branches that the tree isn't much taller.

Maybe the adelgids are putting more stress on the tree than one imagines.?

Good luck to your brother in treating the hemlock.

When I moved into my house 30+ years ago, the wooded property was beautifully filled with mature native hemlocks, oaks and mountain laurel. Only after we moved in did we realize the trees were infested with wooly adelgid (similar to your photo). Systemics (treatment of choice at the time) didn’t help. Within 10 years the hemlocks on our and neighboring properties succumbed. Big costly project to remove them as the dead trees were becoming a hazard.

Sadly we then lost the ash trees (emerald ash borers). Now we and neighbors are removing dying mature beeches (beech leaf miner).

Bill, I notice the green color of the hemlock is faded somewhat -- doubtless from the energy drain from the adelgids.

It appears there was a much larger tree that was cut down (now a stump), to the left, behind that hemlock?

Any idea what kind of tree that was?

Brother and I couldn't guess -- it was a stump when he moved in about 10 yrs ago. Whatever it was, the wood is pretty durable, so prb'ly an oak or hickory. It was not a hemlock as there aren't any in his particular vicinity (the hemlock was almost certainly planted along w/a nearby, same-size Norway spruce).