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Asian Lady Beetles

Large numbers of lady beetles infesting homes and buildings in the United States were first reported in the early 1990s. Ladybugs are normally considered beneficial because they live outdoors and feed on plant pests.

However, one species of lady beetle (Harmonia axyridis) can be a nuisance as they fly to buildings in search of overwintering sites and end up indoors. Once inside they crawl about on windows and walls, often emitting a noxious odor and yellowish staining fluid before dying.

Where Did They Come From?

The Asian Lady Beetle, Harmonia axyridis (Pallas), is relatively new to this country. The beetle is native to Asia, where it dwells in trees and fields, preying on aphids and scale insects. The first field populations in the United States were found in Louisiana in 1988. Since then, the beetle has expanded its range to include much of the U.S. and parts of Canada. Earliest records in Kentucky date back to a few specimens collected in Hickman County in 1992.

Infestation of Buildings

As autumn approaches, the adult beetles leave their summer feeding sites in yards, fields and forests for protected places to spend the winter. Unfortunately, homes and buildings are one such location. Swarms of lady beetles typically fly to buildings from September through November, depending on locale and weather conditions.

Lady beetles are attracted to sides of buildings receiving afternoon sun. Contrasting light-dark features are especially attractive. Studies have shown that Asian lady beetles are attracted to illuminated surfaces. They tend to congregate on the sunnier, southwest sides of buildings illuminated by afternoon sun. Homes or buildings shaded from afternoon sun are less likely to attract beetles. House color or type of construction (concrete, brick, wood/vinyl siding) is less of a factor for attraction than surface contrast.

Contrasting light-dark features tend to attract the beetles. Examples include dark shutters on a light background, light shutters on a dark background, windows edged with light-colored trim, gutters and downspouts on contrasting siding, etc. Dwellings near woods or fields are especially prone to infestation, although those in other locations can be infested as well.

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