Asian Ladybugs: What Are the Dangers?

The invasions of Asian ladybugs mainly take place at the beginning of winter. So when the temperature drops, these little critters tend to settle in our homes. The question is: are they dangerous to humans or are they crops? Asian ladybugs are indeed very different from the European ladybugs we know. Zoom in on this insect like no other.

Development in Europe

The Asian ladybug was voluntarily imported to Europe and the United States in 1980. The aim was to effectively combat aphids in a more ecological and economical way. It must be said that in adulthood the Asian ladybug eats the equivalent of 90 to 270 aphids per day. It also lays about 2,500 larvae throughout its lifespan, which is three years. In 2003, however, it entered more clandestinely via Belgium. Since then, the company that sold them as an insecticide had to stop trading this type of ladybug.

The characteristics of the Asian ladybug

The Asian ladybug is quite difficult to spot among all the extant species. They are best recognized by the number of spots. The Asian ladybug has between zero and nineteen black or red points and measures between 5 and 7 mm, making it the largest in the world

Asian ladybugs
Credit: jax10289/iStock

Are Asian Ladybugs Dangerous?

For other ladybugs, it is a formidable enemy, as it eats not only the eggs of other insects, but also those of local ladybugs. But it also feeds a lot on aphids and scale insects, which makes it beneficial to the garden. The Asian ladybug has parasites in its eggs, so they can cause the death of other insects if ingested.

For the man it is not there no significant risks† The toxins it releases, in some cases, cause allergies† The droppings carry bad odors, but nothing dangerous to humans. The only problem arises when in the fall she invites herself to the walls of buildings by the thousands to find a crevice to shelter and warm over winter. That’s why we find a lot of them in our homes in winter.

How to eliminate it?

By overwintering in homes, Asian ladybugs not only cause allergies, but also degrade the walls and the curtains. The easiest way to get rid of them is to collect them in a large bag or vacuum them up with a vacuum cleaner and put the bag in the freezer. After 24 hours they are dead. Just throw the bag in the trash or use the dead ladybugs as compost.

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