Pine bark adlegids (Pineus strobi) are often referred to as bark aphids. Of all the pines in the Midwest, eastern white pine seems to be the one most often attacked. Light infestations do not do much to the tree. However persistent severely heavy yearly attacks can cause some stunting and possible death of the trees.
The adelgids produce a wax while feeding. The wax is a protective cover that resembles wool, making them look like wooly aphids to which they are related. Under this waxy wool the adelgid is teardrop shaped and black in color.
Insecticides can be used to control these insects. In the spring use a spreader – sticker in insecticide application.