Adelges Piceae, commonly known as the spruce aphid, is a pest that infests spruce trees. There are several synonyms for this insect, including spruce gall aphid, eastern spruce gall aphid, and black spruce aphid. The aphid causes damage to the tree by sucking the sap from the needles and branches, which can cause the tree to decline in health and ultimately die. Prevention and control measures include proper tree maintenance, early detection, and chemical treatments. It is important to regularly monitor spruce trees for signs of infestation to prevent widespread damage and potential loss of the tree.