The eastern US cannot get cold enough for long enough to kill the adelgids off, it just causes them to hibernate, which is why they are such a problem. There is not an area in the eastern US that is not affected.

The main reason the hemlocks are dying off is due to a parasite called the Hemlock Wooly Adelgid. It is a native of Asia and was brought over to here in the 1930s. North American hemlocks have no resistance to this parasite and it is weakening and killing off these needed trees that shade our mountain rivers and…

DO IT!

I’m sorry, you are an alien and need to be taken to a containment cell.