Asian Lady Beetle
Harmonia axyridis
Scientific illustration for identification purposes
Overview
Asian lady beetles were introduced to control aphids but have become a nuisance when they invade homes in fall. They resemble native ladybugs but can be distinguished by the M-shaped marking on their head. They can bite and release a foul-smelling defensive fluid.
How to Identify
- Dome-shaped body about 1/4 inch
- Orange to red with variable spots (0-19)
- Black M or W marking on white head area
- More aggressive than native ladybugs
- Foul smell when disturbed
Behavior
Asian lady beetles congregate on sunny building walls in fall, seeking overwintering sites. They release a foul-smelling, staining defensive secretion. They can bite if handled.
Habitat
Beneficial predators in gardens and crops during summer. In fall, they seek overwintering sites including homes, often on white or light-colored buildings.
Diet
Adults and larvae feed on aphids and other soft-bodied insects. Beneficial in gardens but become pests when they enter homes.
Reproduction
Females lay clusters of yellow eggs on plants with aphid populations. Multiple generations per year. Adults overwinter and emerge in spring.
Distribution in the Southern U.S.
Common throughout Texas, Oklahoma, Louisiana, and Mississippi.
Regional Notes
Fall invasions can be significant when conditions favor large beetle populations. They may become active on warm winter days indoors.
Signs of Infestation
- Orange-red beetles on sunny exterior walls
- Beetles entering through gaps in fall
- Clusters of beetles inside windows
- Foul smell when beetles are disturbed
- Yellow-orange staining where beetles congregate
Prevention Tips
- Seal gaps around windows and doors
- Install door sweeps
- Repair damaged screens
- Caulk around utility penetrations
- Vacuum beetles indoors (do not crush)
- Light-colored homes are more attractive
When to Contact a Professional
Contact a professional for large fall invasions or to apply barrier treatments before beetles congregate.
Romex Pest Control provides professional asian lady beetle control services across Texas, Oklahoma, Louisiana, and Mississippi.
Learn about our asian lady beetle control servicesFrequently Asked Questions
Do Asian lady beetles bite?
Yes, Asian lady beetles can bite if handled or trapped against skin. The bite is more of a pinch and rarely breaks the skin, but it can be annoying.
Are Asian lady beetles the same as ladybugs?
Asian lady beetles are in the same family as native ladybugs but are a different species introduced from Asia. They are more aggressive, can bite, and invade homes in large numbers.
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