The Eastern Boxelder Bug (Boisea trivittata) is a common true bug found throughout North America. These insects are best known for their bright red markings on a black body and their tendency to gather in large numbers on sunny walls of buildings during fall.
Quick Facts
- Family: Rhopalidae
- Habitat: Boxelder, maple, and ash trees
- Diet: Seeds and plant juices
- Status: Household nuisance
Identification
Boxelder bugs have elongated black bodies with distinctive red or orange lines along the thorax and wings. Adults measure about 1/2 inch long.
They belong to the group of true bugs which possess piercing-sucking mouthparts.
Distribution
These insects are widely distributed across North America, especially in areas where boxelder and maple trees grow.
Life Cycle
Eggs are laid on host trees in spring. Nymphs hatch and develop through several stages before becoming adults.
Pest Status
Boxelder bugs rarely damage plants but often become nuisance pests when they invade homes seeking winter shelter.
Prevention
- Seal cracks around windows and doors
- Remove seed-producing boxelder trees near buildings
- Reduce outdoor hiding places
Control
Vacuuming indoor insects and sealing entry points is the most effective control strategy.