Hemlock Wooly Adelgid - Identification and Control

Hemlock wooly adelgids use piercing-sucking mouth parts and feed only on hemlock tree sap. Immature nymphs and adults damage trees by sucking sap from the twigs and at the base of the needles. The tree loses vigor and prematurely drops needles. This loss of vigor and loss of foliage can eventually cause the tree to die. If left uncontrolled, the adelgid can kill a tree in a single year.