The Hemlock Woolly Adelgid is an aphid-like invasive pest native to eastern  Asia that attacks hemlock trees by attaching to needles and sucking the sap of the tree. It can be identified by its  white woolly egg sack covering  present on the underside of branches. Trees infested with adelgids typically lose all their needles and die within 4 years of the first infestation.


Quabbin Forest Showing Hemlocks