Keeping boxelder bugs out is important because, although harmless, they swarm homes in the fall and leave stains indoors.

Boxelder bugs are mostly a nuisance when they enter homes as the weather turns cooler in fall. Here is how to prevent them from invading.

Native to the U.S., boxelder bugs sometimes become a nuisance for homeowners in the fall. “They are relatives of stink bugs,” says Matt Bertone, PhD, director of the Plant and Disease Insect Clinic at ...