The Usutu virus, which is transmitted by the Culex pipiens mosquito – commonly known as the house mosquito – does not harm humans in the UK, but often proves fatal to birds
Blackbirds are facing a threat(Image: Avatarmin via Getty Images)
UK households are being encouraged to take swift action in their gardens as the deadly mosquito-borne Usutu virus threatens to wipe out blackbird populations nationwide. Ecologists are calling on families to make small changes that could greatly help protect one of our most beloved garden birds.
Data first revealed in June showed a 40% decrease in blackbirds in Greater London since the virus was first detected in 2020 – and with climate change assisting mosquitoes in broadening their range, experts warn that the problem is set to worsen. The Usutu virus, carried by the Culex pipiens mosquito – also known as the house mosquito – poses no threat to humans in the UK, but often results in death for birds – especially blackbirds, who are particularly prone to infection.
With longer summers, rising temperatures and heavier rainfall creating ideal breeding conditions for mosquitoes, ecologists caution that climate change is allowing diseases like Usutu to gain a foothold in the UK for the first time.
The virus is now deeply rooted in Britain’s wild bird population and further declines in some species are expected unless steps are taken to mitigate additional pressures such as habitat loss and food scarcity. Ecological experts at Arbtech are now urging families to support one of Britain’s most common garden visitors, whose numbers are under threat.
A spokesperson for Arbtech said: “Blackbirds are more than just a familiar visitor to our gardens – they’re important seed dispersers and insect predators, helping to regulate pest populations and support healthy ecosystems.
“But they’re under real pressure. Diseases like Usutu virus, which can cause tremors, disorientation and even sudden death in infected birds, are an emerging threat – and many people still don’t realise the impact it’s already having.
“The good news is that households with even a small garden can make a real difference. Simple actions like planting native shrubs, providing clean water and avoiding pesticides all help create safer, healthier habitats for blackbirds to feed, nest and thrive.”
Families can help(Image: Yaorusheng via Getty Images)Seven ways to help protect blackbirds in your garden
Make sure to clean all bird feeders and feeding stations at least once a week to reduce the risk of disease transmission amongst birds.
If you spot any sick or dead birds, it’s vital to report it to Garden Wildlife Health or the Animal and Plant Health Agency (APHA), as early reporting helps in tracking outbreaks like Usutu. The symptoms of the Usutu virus in blackbirds can differ, but infected birds often display signs of severe neurological and physical distress.
Common symptoms include tiredness or weakness, loss of coordination, unsteady movement, disorientation or strange behaviour (such as not fleeing from humans), tremors, seizures, and fluffed-up feathers – a typical sign of illness in birds. Think about making wildlife corridors by leaving spaces in fences or planting hedgerows to help blackbirds and other species move safely between gardens.
Be careful when buying garden products. Imported bird boxes or bee hotels could bring in pests or diseases. Where possible, choose items made in the UK or sourced naturally.
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