Asian beetles, such as the Asian lady beetle, do not multiply during winter. They stop laying eggs and enter a dormant state called diapause, surviving the cold in sheltered spots until spring brings warmer temperatures that allow them to resume reproduction.

How Asian Beetles Survive the Winter

When temperatures drop and daylight hours shorten, Asian beetles prepare for winter by seeking out protected places. They often gather in groups under tree bark, inside wall voids, attics, or other enclosed spaces. In this sheltered state, known as diapause, their metabolism slows down and they conserve energy to survive until conditions improve.

Why They Don’t Reproduce in Winter

Cold Temperatures: Egg development and larval growth require consistent warmth. Below about 50°F (10°C), reproduction stops.

Short Daylight: Many insects rely on daylight length as a signal to breed. In winter, shorter days trigger diapause.

Energy Conservation: Maintaining body functions in the cold uses energy. By pausing reproduction, beetles focus on survival.

Local Winter Conditions

In Nashua, New Hampshire, winter temperatures commonly dip below freezing for extended periods. These cold conditions ensure that Asian beetles remain inactive, clustered in their hiding spots until spring.

Practical Tips for Homeowners

• Seal Entry Points: Caulk cracks around windows, doors, and utility lines to prevent beetles from entering your home.
• Remove Indoor Clusters: Use a vacuum cleaner to gently remove beetles from walls or windowsills, then empty the bag outside.
• Maintain Screens and Weatherstripping: Fix torn window screens and replace worn weatherstripping to keep beetles out.
• Monitor Attic and Crawl Spaces: Check these areas for large aggregations and remove beetles before they enter living spaces.
• Consider Professional Inspection: If beetles are widespread, a pest control specialist can identify entry points and recommend targeted treatments.