However, aphids have long antennae and characteristic cornicles, or pipe-like tubes arising from the tip of the abdomen.
Adelgids have short antennae and no cornicles.
This pest is found throughout all of North America, wherever its host spruces are grown. It has also been exported to Europe. This pest prefers Norway and white spruces, but is occasionally attacks red, black, Englemann and Colorado spruces. Damage The pineapple-shaped galls greatly stunt the growth of new spruce shoots. Trees demonstrate a wide range of susceptibility, some have many galls which kill the branch and others having few galls which allow for continued branch growth.