Pest experts are urging households to leave one thing on their windowsills to deter swarms of ladybirds invading UK homes this October.
Across the UK, more and more people are reporting seeing ladybirds massing in their houses, especially around windows and doors.
This is because ladybirds have begun moving indoors for winter, seeking out shelter ahead of the colder temperatures. In particular, non-native harlequin ladybirds are the ones most commonly spotted in houses as they originate from warmer countries.
Max Barclay, Senior Curator of Beetles at the Natural History Museum, says: “There are a number of species of ladybirds that hibernate in big clusters. Ancestrally harlequin ladybirds would probably have hibernated in big clusters in caves, hollow trees and other sheltered places.
“In absence of these, they may well try and gain entrance to your home. The easiest way for them to do this is through the small gaps along the edges of loose-fitting windows.”
But there is something you can do to deter ladybirds, say experts.
Pest control firm Pest Defence says citrus peel and essential oils both work to deter the little red beetles.
They explain: “In recent years, a relatively new species of ladybird known as the Harlequin has been causing concern to homeowners, many of whom have experienced an infestation. These Japanese ladybirds were first introduced to the UK in 2004, and research suggests that as their numbers have risen, those of native ladybirds have fallen.
“When the temperatures outside start to drop – particularly around September and October – ladybirds tend to try and seek out somewhere warmer to live, which means that during the cooler months they are drawn to households and buildings.”
To stop ladybirds, you can leave out citrus peels at key entry points like windowsills, such as orange and lemon peel, the firm says.
Otherwise, seal up entry points like the cracks and gaps around windowsills and doors and keep your house clean.
The firm’s advice explains:
“Here’s how you can help prevent a ladybird infestation:
- Seal up any entry points – If you have cracks and gaps, especially around doors, windows and vents, then apply mesh or use sealant to help block this potential access route.
- Use natural scent deterrents – Anecdotal evidence suggests ladybirds dislike strong scents, such as citrus, cloves and bay leaves.
- Keep your home clean and clutter-free – Undisturbed areas piled with clutter make the perfect home for ladybirds. By cleaning and tidying, you make your home less inviting to them.