Box Elder in Lehi, UT

Adult size is about 1/2", all black with red lines on their back. They love feeding on Box Elder and Maple trees. Box Elder bugs are not dangerous but can be a major nuisance. In the fall, they can try to enter homes in swarms looking for places to hibernate. Best control includes sealing cracks and crevices along windows, doors, and rooflines and treating with a residual insecticide on the flat surfaces/entry points of the home, especially the sunny sides (they will cluster on southern and western facing sides of trees and buildings). There are not really any DIY methods of control, a licensed technician using pro-grade products will be the best way to control these nuisance pests.