IDENTIFICATION
Adult boxelder bugs are about 1/2” long, dark brown or black with conspicuous red markings. Immature boxelder bugs are smaller and a solid bright red color. Only the adults are capable of overwintering successfully.
NON-CHEMICAL CONTROL STEPS TO HELP YOU WITH BOXELDER BUGS
Physical removal with a vacuum is the best. Also caulking with paintable silicon around doors, windows, pipes and light fixtures will help.