Boxelder Bug

Identification

• black bugs with red markings on body
• immature forms are smaller but easily distinguished from adults by their lack of wings and red abdomens
• look similar to red fire bugs and other related groups

Nesting Habits

• found in and around buildings in the spring and fall
• female boxelder trees or other seed-producing maples
• overwinter in cracks and crevices of buildings, especially in unshaded, sunny sides/areas of exterior walls or leaf litter

Diet

• prefer boxelder seeds, which are only found on female boxelder trees, but may feed on other maple seeds

Significance

• nuisance: congregate on exterior walls of buildings in spring and summer; can come indoors and annoy occupants
• overwinter in cracks and crevices in buildings
• may stain lightly colored materials and emit an unpleasant odor when smashed
• not a health threat

IPM Recommendations

• Remove female boxelder trees in the area if possible.
• Seal cracks that may allow boxelder bugs to enter buildings.
• Use a vacuum cleaner to remove indoor populations.
• Remove boxelder from tree planting lists.
• Plant non-maple trees to eventually shade sides of buildings where box elder bugs like to congregate.
• Vacuum often during spring and fall.

For more information, see our Boxelder Bug fact sheet.