A broom can also be used to remove beetles indoors, but is more likely to cause staining. Because H. axyridis seeks out overwintering sites in the fall, exterior cracks and openings can be sealed as a long-term, preventive measure. Adjust or install tight-fitting door sweeps or thresholds at the bottom of all exterior entry doors. Gaps under sliding glass doors may be sealed with foam weatherstripping. Holes can be plugged with caulk, cement, urethane foam, steel wool, or copper mesh.
Caulk cracks around windows, doors, siding, and facia boards.
Use a good quality silicone or siliconized acrylic latex caulk. Although somewhat less flexible than pure silicone, siliconized latex-type caulks clean up with water and are paintable. Caulks that dry clear are easier to use than pigmented ones because they cover mistakes. Repair damaged window screens and install insect screening behind attic vents. These practices will also help prevent entry of other pests, such as flies, mosquitoes, wasps, crickets, and spiders.