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Ladybug's Invasive Cousin: A Centuries-Old Invasion
4 Oct
Summary
- Introduced to control pests, it became a major invasive species.
- Outcompetes native ladybirds for food and habitat.
- Can be a nuisance in homes, releasing unpleasant fluid.
The multicoloured Asian lady beetle, Harmonia axyridis, was intentionally released in the United States starting in 1916 to combat crop pests like aphids. This biological control agent proved highly effective but also unexpectedly became a significant invasive species.
Wild populations were first documented in Louisiana in 1988, and the beetle has since spread globally due to its adaptability and rapid reproduction. It thrives in diverse environments, feeding on a wide range of prey.
While beneficial in controlling agricultural pests, its success has come at a cost. The beetle outcompetes native ladybird species for food and habitat, posing a threat to biodiversity.
In autumn, adult beetles seek shelter in homes, becoming a nuisance. They can release an unpleasant-smelling fluid when disturbed, staining surfaces. Despite initial intentions, the Asian lady beetle's legacy is a complex one of both utility and disruption.
