Having problems with ladybirds?
The Harlequin ladybird has a very variable appearance, which can make it difficult to tell apart from our native ladybirds. They are often found in a cluster in window frames and corners of rooms.
Additional Information
Identifying the Harlequin Ladybird
The Harlequin ladybird varies significantly in appearance, making identification challenging. This invasive species often gathers in window frames and room corners, especially during colder months.
Size and Shape
Harlequin ladybirds measure 7-8 mm in length, making them larger than most native UK species. They have a rounded, dome-like body with a smooth, glossy surface.
Colour and Patterns
Their wing cases (elytra) display a wide range of colours and markings:
- Pale yellow-orange, orange-red, red, or black
- 0-21 black spots or a grid-like pattern
- Common UK variations:
- Orange with 15-21 black spots
- Black with two or four red or orange spots
The pronotum (the plate covering the thorax) appears white or cream with distinct markings, including:
- Up to five black spots
- Two curved lateral lines
- An M-shaped mark
- A solid trapezoid shape
Additional Features
- A broad keel at the base of the wing cases
- Typically brown legs, differing from native ladybirds
These distinct features help differentiate Harlequin ladybirds from native species. Their adaptability and aggressive nature have contributed to their spread across the UK, impacting native ladybird populations.
Remedy:
Harlequin Ladybirds in the UK: A Growing Concern
The UK hosts many native ladybird species, but the Harlequin ladybird now threatens their survival. Originally from Japan and Korea, it was introduced to Europe for aphid control in greenhouses. By 2001, it had spread into the wild, appearing in Belgium, Germany, and by 2005, the UK. First reported in London, it continues to spread north and west, rapidly becoming established.
Why Harlequin Ladybirds Are a Problem
Large swarms often gather on buildings, both outside and inside, alarming residents. Their activity peaks in autumn, but mild winter days may bring them out again. When disturbed, they release a foul-smelling liquid that stains fabrics. While they cause no structural damage, their presence is a nuisance. More concerning, Harlequin ladybirds compete aggressively with native species, disrupting ecosystems and reducing biodiversity.
How to Prevent Ladybird Infestations
Blocking entry points keeps ladybirds out of buildings. Seal gaps around windows, doors, vents, and other openings. Properties prone to infestations benefit from thorough proofing to reduce repeat problems.
Removing Ladybirds from Indoors
A vacuum cleaner provides an easy and effective way to remove ladybirds inside buildings. This method prevents damage to walls and furniture but does not stop re-infestation. Without sealing entry points, ladybirds may continue to return.
Protecting Native Ladybirds
Preventing Harlequin ladybirds from spreading helps protect native species. By controlling infestations and raising awareness, efforts can slow their impact. The UK’s biodiversity depends on maintaining a balanced ecosystem where native ladybirds thrive.
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.
DO LADYBIRDS CARRY DISEASES?
Ladybirds are generally considered beneficial insects due to their role in controlling aphid populations. However, certain species, particularly the Harlequin ladybird (Harmonia axyridis), have been associated with some concerns.
Do Ladybirds Carry Disease?
While ladybirds do not transmit diseases to humans or pets, the Harlequin species is known to carry a sexually transmitted fungal disease called Laboulbeniales. This fungus spreads between ladybirds through mating and does not pose any threat to humans or animals.
Can Ladybirds Bite?
Ladybirds do not sting, but they can bite if food sources are scarce. Their bites are rare and typically harmless, though some individuals may experience mild skin irritation.
Other Risks Associated with Ladybirds
- Defensive Secretions – When threatened, ladybirds release a yellowish, foul-smelling liquid from their leg joints. This substance can stain furniture, carpets, and walls if large numbers of ladybirds gather indoors.
- Allergic Reactions – In rare cases, some people may develop an allergic reaction to ladybird secretions, experiencing symptoms such as skin irritation or respiratory discomfort.
Ladybirds in the Home
Ladybirds often seek shelter in homes during autumn and winter, clustering in large numbers to hibernate. While they do not cause structural damage, their presence can be a nuisance, especially if they leave stains on surfaces.
If ladybirds become a problem, humane removal methods such as gently relocating them outdoors or sealing entry points can help prevent infestations.
Request a Quote Today
Reach Us
Location :
4 Compton Close, Didcot, Oxfordshire, OX11 7HD
Email :
office@shire-pest-solutions.co.uk
Phone :
01235399073