About Asian Lady Beetle
The multicolored Asian lady beetle (Harmonia axyridis) was intentionally introduced to North America as a biocontrol agent for aphids on crops and ornamentals. It proved effective as a predator but became a major nuisance pest when massive numbers began overwintering inside wall voids, attics, and window frames in the 1990s. When disturbed it releases a pungent yellowish defensive fluid (reflexive bleeding) that stains walls and triggers allergic reactions in sensitive people. It has also displaced native ladybug species across North America through competition for resources and intraguild predation on eggs and larvae.
Geographic Distribution
This insect is found across Asia, with notable populations in China and surrounding regions.
Management
If you suspect a Asian Lady Beetle problem, consult our recommended exterminator services or browse our full pest species database for related species and control guidance.