Ladybirds

The Harlequin ladybird has a highly variable appearance, making it difficult to distinguish from native ladybirds. They are often found clustered in window frames and room corners. They are large and round, measuring 7-8 mm (about 1/4 inch). Their elytra (wing case) can be pale yellow-orange, orange-red, red, or black, with patterns ranging from 0-21 spots or a grid pattern. The most common forms in the UK are orange with 15-21 black spots or black with two or four orange or red spots. The pronotum is white or cream with up to five spots or fused lateral spots forming two curved lines, an M-shaped mark, or a solid trapezoid. Other characteristics include a wide keel at the base of the elytra and usually brown legs.

There are many types of ladybird in the UK, but recently, a new variety called the Harlequin ladybird has been introduced, posing a potential threat to native species. Originating from the Far East, including Japan and Korea, the Harlequin ladybird was brought to several European countries to control pest insects like aphids in greenhouses. However, it soon established itself in the wild, first in Belgium in 2001, then in Germany in 2003, and the UK in 2005. Initially reported in the London area, it is now spreading rapidly north and west and is likely to become widely established in the UK.

Large numbers of ladybirds on the outside of buildings, and sometimes inside, may concern residents. This activity peaks in the autumn for a few weeks, but once inside, wandering ladybirds can appear on mild days throughout the winter. When disturbed, these beetles produce a foul-smelling liquid that can stain fabrics. Although they do not damage the building itself, their presence can be a nuisance. The Harlequin ladybird is more vigorous than native species, raising concerns about its potential adverse impact on their populations. Controlling this invasive species is important to protect the native ladybird varieties.

To prevent ladybirds from entering buildings, proofing entry points is effective. Ensuring windows, doors, and other potential entryways are sealed can significantly reduce the number of ladybirds getting inside. This preventive measure is especially useful for properties that regularly experience ladybird invasions. Ladybirds within buildings can be removed using a vacuum cleaner. This method is simple and efficient, allowing you to remove the insects without harming them. However, this is often a temporary solution and might need to be repeated if the entry points are not properly sealed.

Residual insecticides labelled for ‘beetles’ or ‘crawling insects’ and applied to crevices and entry points around buildings are likely to kill Harlequin ladybirds, but beware; native ladybird species may also be present in the same hibernation sites within buildings. Care must be taken to avoid harming beneficial native species while targeting the invasive Harlequin ladybirds. If a heavy infestation occurs, contacting a professional pest control company is recommended.

Our trained professionals have the technical knowledge and access to a range of products and equipment not available to the public, ensuring effective and safe removal of the ladybirds. They can also provide advice on preventing future infestations and protecting native ladybird populations.

In conclusion, managing the spread of the Harlequin ladybird is crucial to preserving the native ladybird species in the UK. By sealing entry points, using vacuum cleaners for removal, and applying residual insecticides with caution, you can reduce the number of ladybirds entering your property. For severe infestations, professional pest control services offer the most effective and safe solution, helping maintain ecological balance and prevent harm to native species.