Hemlock is the third most common tree species in Vermont. But it soon may drop off the list, going the way of the now-vanished chestnut and elm. An invasive pest, hemlock woolly adelgid, has been marching and munching its way north along the Appalachians — killing pretty much every hemlock it can sink its sap-sucking mouthparts into. The adelgid recently arrived in southern Vermont.
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