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Nature

Asian Lady Beetle

What is asian lady beetle?

· Emily Grant

Key facts

Scientific name Harmonia axyridis[3]
Family Coccinellidae[5]
Native range Asia[3]
Purpose of introduction Control aphids and other crop pests[2]
U.S. first field populations 1988 in Louisiana[6]
Common indoor behavior Accumulates on buildings and wanders indoors in fall[1]

The Asian lady beetle (*Harmonia axyridis*) is a lady beetle species native to Asia, introduced to North America for pest control, and now widespread as both a beneficial predator and a household nuisance. It is often confused with the Japanese beetle, but they are different insects.

Context

The Asian lady beetle is a lady beetle species native to Asia, introduced to North America for biological control of aphids and other soft-bodied pests [3]. It is now widespread in parts of North America and is often seen as beneficial outdoors but a nuisance when it enters homes in fall and winter [1]. It is also called the harlequin ladybird, multicolored Asian lady beetle, Japanese lady beetle, and Asian ladybug/beetle [4]. Its scientific name is *Harmonia axyridis* [3].

Documented claims

  • The Asian lady beetle feeds on aphids and other soft-bodied insects. [2]
  • Outdoors, it is considered beneficial for biological control in crops and gardens. [1]
  • Indoors, it is a nuisance but does not transmit disease. [1]
  • It may pinch or bite, but reports say it does not seriously injure humans. [1]

Related

Carpet BeetleBoth are common household pests that people often confuse with each other.Lily BeetleBoth are beetle species that gardeners commonly encounter and need to identify.

Questions and answers

Should Asian lady beetles be killed?

Outdoors, they are beneficial and should be left alone. Indoors, they are a nuisance but harmless; you can vacuum them or sweep them out rather than kill them [1].

Are Asian lady beetles invasive in Canada?

They are introduced to North America and have spread widely, including into Canada, but sources describe them as beneficial outdoors despite being a nuisance indoors [1].

Are Asian lady beetle bites harmful?

They may pinch or bite, but reports say they do not seriously injure humans [1].

How do I get rid of Asian lady beetles?

Seal cracks and gaps around windows and doors, and vacuum or sweep them up when they enter. They do not transmit disease [1].

Sources

  1. Asian Lady Beetle | Missouri Department of Conservation — mdc.mo.gov (retrieved August 3, 2026)
  2. Asian Lady Beetle | University of Connecticut — homegarden.cahnr.uconn.edu (retrieved August 3, 2026)
  3. The Multicolored Asian Lady Beetle — ars.usda.gov (retrieved August 3, 2026)
  4. Asian Lady Beetle Infestation of Structures - Entomology — entomology.mgcafe.uky.edu (retrieved August 3, 2026)
  5. Mostly a good guy: multicolored Asian lady beetle — crops.extension.iastate.edu (retrieved August 3, 2026)
  6. Multicolored Asian Lady Beetle — extension.missouri.edu (retrieved August 3, 2026)

Sources last checked August 3, 2026. · More in Nature