Why Flies and Ladybugs Keep Invading Your Home—And How to Stop Them
If you’ve noticed an invasion of flies and ladybugs every year—especially as the seasons change—you’re not alone. Homeowners across Maryland, including here in Howard County, often deal with these persistent pests. But what causes them to come inside? And more importantly, how can you prevent it?
The Most Likely Entry Points
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Tiny Cracks and Gaps
Even the smallest cracks around windows, doors, and siding can be open invitations. Ladybugs and flies are excellent at squeezing through openings in search of warmth or food. -
Attic and Soffit Vents
These insects love to overwinter in attics. Damaged screens or improperly sealed vents make easy access points. -
Chimneys and Rooflines
Chimneys that lack proper caps or screens are a haven for pests seeking shelter from the cold. -
Open Doors and Windows
It might seem obvious, but doors left ajar (even for a few seconds), or screens with tiny tears, allow bugs in—especially in the fall when ladybugs swarm.
Why They’re Coming In
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Flies are often drawn in by smells—food scraps, garbage, or pet waste near your home.
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Ladybugs seek warmth and hibernate indoors during colder months. They often appear in large numbers in the fall and early spring.
How to Prevent Future Infestations
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Seal all cracks around doors, windows, and the foundation with caulk or weatherstripping.
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Install fine mesh screens on vents, soffits, and chimneys.
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Use door sweeps on exterior doors.
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Keep your home exterior clean—especially near trash cans, compost bins, or pet areas.
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Consider natural deterrents, such as citronella, cloves, or bay leaves around windows.
Bonus Tip for Homeowners
Regular seasonal maintenance—including a simple fall and spring home inspection—can go a long way in keeping pests outside where they belong.