Most Unwanted: Harlequin ladybird
Harmonia axyridis
Habitat: Terrestrial
Threat: Alert: Specimen found in Ireland
Status: Potential
The harlequin ladybird has been extensively introduced worldwide for biological control of aphids. It is also a pest species, out-competing native ladybird species and taking shelter in dwellings during the winter months. In 2004 this species arrived in Britain.
What is it?
It is a species of ladybird which tend to be larger than native species. Unfortunately the colour and pattern of spots on this species is highly variable making identification by a member of the public very difficult. Please refer to the UK’s Harlequin Ladybird Site for more information on how to identify this species.
Impacts
Harlequin ladybirds can severely reduce the diversity of native ladybird species. It does this by predating on the food source for these species while also predating on the native ladybirds themselves.
This species can become a nuisance to homeowners as it seeks refuge from adverse weather conditions in houses.
Where are they from?
Native to Asia.
Where are they now?
This species is now present in many parts of Europe, including Britain. They are also invading North and South America.
How can they get here?
Contamination of imported vegetables.
Contamination of imported ornamental plants.
Intentional introduction for control of pest aphid species.
Possible stow away on sea freight.
What you can do to help?
Do not introduce this species of ladybird to Ireland.
Keep watch for this species in imported vegetables and ornamental plants.
Report all sightings.
Additional informationt
Ladybirds of Ireland website
