Utah State University Extension
This basic fact sheet describes balsam woolly adelgid, a tiny sucking insect that is a serious pest of true firs in forests, landscapes and in seed and Christmas tree production. It includes a description of tree injury and symptoms, life history and identification, monitoring, management, and implications to forest health.
Alston, Diane G.; Davis, Ryan; McAvoy, Darren; Spears, Lori R.; Malesky, Danielle; Hebertson, Liz; and Keyes, Colleen, "Balsam Woolly Adelgid - Basic Fact Sheet" (2018). All Current Publications. Paper 1839.