Identify and remove box elder seedlings and saplings as soon as possible
Pull small plants by hand when soil is moist
Dig out the entire root system for larger plants
Cut mature trees down if removal is necessary
Apply a systemic herbicide to freshly cut stumps
Treat resprouting stems with herbicide as needed
Mow or trim young growth repeatedly to weaken it
Remove female trees to reduce seed production
Clean up fallen seeds and debris
Seal cracks and openings to prevent box elder bugs from entering buildings
Repair screens, doors, and window gaps
Reduce moisture and standing water near the home
Keep firewood, leaf litter, and clutter away from the foundation
Use a vacuum to remove box elder bugs indoors
Apply exterior insecticide around entry points if needed
Contact a licensed arborist or pest control professional for large infestations or large trees