Invasive ‘Death Spiral’ Ladybugs Have Been Spotted, Officials Warn of Their ‘Unpleasant Smell’ and Biting

Invasive ‘Death Spiral’ Ladybug Seen Across the US

The invasion of the ‘death spiral’ ladybug has been reported nationwide, with states like Illinois, Ohio, Michigan, Pennsylvania, Virginia, and New York at a higher risk of encountering these pests. These invasive multicolored Asian lady beetles are causing concern among homeowners due to their unpleasant smell and biting tendencies. As the temperatures drop and autumn sets in, these unwelcome guests are seeking warmth and shelter in homes, leading to clusters forming around houses.

Often mistaken for native ladybugs, the Asian lady beetle, scientifically known as Harmonia axyridis, is causing a stir with their biting, swarming, and foul odour when disturbed. Pest-control experts and extension services have issued alerts, urging residents to take preventive measures against infestations. The insects, originally from Asia, exhibit a behaviour known as the ‘death spiral’ where tightly clustered swarms spin and exhaust themselves in their relentless search for shelter.

According to Scott Baker, an extension agent in Virginia, these beetles are mostly unnoticed outdoors during the growing season, but become a nuisance as they look for places to overwinter. The swarms of Asian lady beetles can be seen gathering on walls, windows, and eaves of homes, fascinated by light and warmth. They sneak indoors through small openings, posing a challenge for homeowners trying to keep them out.

While the Asian lady beetles do not pose a direct threat to humans or property, they release a defensive fluid when crushed, emitting a strong odour that can stain surfaces. Additionally, these pests may bite when trapped, though it is uncommon for their bites to break the skin. Their aggressive presence can disrupt the ecosystem by outcompeting native ladybug species, ultimately impacting biodiversity.

Although the Asian lady beetle is widespread across the US, it is more commonly reported in northern and midwestern states, with cooler climates favouring heavier infestations. To prevent an invasion, experts recommend sealing cracks, repairing damaged screens, and vacuuming indoors to remove any beetles that have made their way inside. These measures can help curb the spread of these pests and mitigate their impact on homes.

As homeowners grapple with the influx of invasive ladybugs, it is crucial to stay vigilant and take proactive steps to deter these pests from making their way indoors. By understanding their behaviour and implementing preventive strategies, residents can minimise the nuisance caused by the ‘death spiral’ ladybugs. Stay informed and prepared to combat these unwelcome guests as they seek shelter in the warmth of homes across the country.