Asian Lady Beetles

Asian lady beetles are a common seasonal nuisance pest in Michigan, especially in the fall. While they are often mistaken for native ladybugs, they behave very differently around homes. They do not bite or reproduce indoors, but they can gather in large numbers and become a persistent indoor nuisance if not prevented.

Asian Lady Beetles

Overview
Asian lady beetles are most noticeable in late summer and fall as they seek warm, protected areas to overwinter.

Behavior
They congregate on sun-exposed exterior walls, siding, and window areas, particularly on the south and west sides of homes. As temperatures drop, they enter through small gaps and openings and remain hidden inside wall voids until warmer days cause them to reappear indoors.

How to Identify Them
Asian lady beetles range from orange to red with varying numbers of black spots. A common identifying feature is the pale “M” or “W” marking behind the head. They are often found in large groups.

Why They’re a Pest
Although they do not cause structural damage, they can appear in high numbers and become a major nuisance. When disturbed or crushed, they can release an odor and may leave yellowish stains on walls, curtains, and surfaces.

Common Asian Lady Beetle Entry Points

Overview
Asian lady beetles rely on small structural gaps to enter homes, often unnoticed until activity appears indoors.

Behavior
They crawl into protected areas to overwinter and remain hidden until conditions trigger movement.

How to Identify Entry Areas
Common entry points include:

• Gaps around windows and door frames

• Siding seams and exterior trim joints

• Soffits, fascia, and attic vents

• Utility penetrations and foundation cracks

Why Entry Points Matter
Without sealing these access points, Asian lady beetles will return seasonally. Prevention depends on stopping entry before they get inside.

Why Interior Treatments Aren’t Effective

Overview
Interior treatments are commonly requested but are rarely effective for Asian lady beetles.

Behavior
They do not nest or reproduce indoors and often remain hidden in wall voids beyond the reach of treatments.

How Control Is Commonly Misapplied
Spraying indoors typically kills only visible beetles and does not prevent new ones from entering.

Why Exterior Prevention Works Best
Exterior perimeter treatments combined with exclusion prevent beetles from entering in the first place, reducing indoor activity without unnecessary indoor pesticide use.

Seeing Asian Lady Beetles Indoors?

Asian lady beetles require a preventative, seasonal approach. If you’re seeing repeated activity or want to reduce fall infestations, use the contact form and we’ll help determine the best strategy for your home.