Salisbury and District Beekeepers Association (SDBKA)
Yellow-Legged Asian Hornet
Welcome to the SDBKA Asian Hornet Team (AHT) website
The Yellow Legged Hornet (YLH) or Asian Hornet (AH) is the insect world's top predator. It is beginning to establish itself in Kent and elsewhere across south UK. It arrived into France from China in 2004 and has spread quickly in all directions across Europe, causing major environmental damage and some fatalities, and decimating honey bee colonies. Its impact on the insect food chain is huge - honey bees are only a part. Consequently it impacts the whole of the environment and agriculture, and ultimately our economy and society. Asian Hornets will affect us all in some way.
An individual is docile however, it can be dangerous to people, farm animals and pets, because it will aggressively defend its nest in a mass attack, if provoked.
Stay more than 10m away from a nest
Latest News
Defra update 25.4.25
The National Bee Unit (NBU) informed us that they have received 3 further credible reports of YLH’s, including the first hornet caught in an NBU-placed trap. On 17th April a householder in Hythe, Southampton submitted a credible report of a YLH trying to build a nest in a playhouse in the garden. The householder was able to capture, confirm the species and kill it. However, it has not been possible to make contact with the reporter to verify or obtain the specimen as yet. This is approx. 4.5km from the Marchwood sighting 2 weeks ago and from the Marchwood nest in 2023.
On 19th April, a YLH was reported by the YLAHT (Yellow-Legged Asian Hornet Team) Coordinator for Ashford on behalf of a householder in Folkestone, Kent (adjacent to the Channel tunnel freight terminal). The YLH was found the previous afternoon in a conservatory, initially alive. A bee inspector collected the hornet on the same day which was sent to Fera Science.
On 23rd April, a local bee inspector found a YLH in an NBU-placed trap approx. 200m from the previous reported sighting in Marchwood, Hampshire.
The local Yellow-Legged Asian Hornet Teams have been contacted and asked to monitor responsibly in all these areas.
An AH queen was found in Marchwood around 8 April, near where two nests were found in 2023. It has been sent for DNA analysis to work out whether she had overwintered and was born last year, or she had newly arrived from France.
Other sightings:
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20 March. Canterbury, Kent. Single hornet captured
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24 January. Oswestry, Shropshire. Single hornet captured. In a shipment of French vegetables
Overview
The first sightings in 2025 were a month earlier than in 2024, which was a month earlier than in 2023. The signs are that AH will soon become established as the modelling and EU experience predicts.
2024. 24 nests destroyed - South East England. First evidence of overwintering/breeding in UK.
29,611 public reports (71 confirmed - 0.2%).
Defra has classified it as an Invasive Non-Native Species and Defra's Contingency Plan requires Bee Keeping Associations to establish Asian Hornet Teams (AHTs) to help organise a bottom-up, community defence for 2025, with AHTs, beekeepers and everyone in our communities collaborating closely. Our priority is to Monitor, Identify (correctly) and Report (using the government's Asian Hornet Watch app)
Asian Hornets have been found in Somerset and Hampshire, we need to be prepared for them in Wiltshire as there is new evidence that they have arrived.
To find out more, please see the excellent BBC Killer Hornets video on iPlayer
Please download the government's Asian Hornet watch app, read the information below and act.
Monitor......................Identify.......................Report
Your community needs you
Keep scrolling down
2023-2024
72 Asian Hornet nests were found and destroyed in 2023 and 23 in 2024. However 2024 was a very bad year for all Hymenoptera (wasps, hornets and bees), due to the bad weather. The early signs are that 2025 will be a much better year for Hymenoptera in general and asian hornets in particular
Secondary nests are the major threat but the first ones are not expected until August/September. Now is the time for monitoring with your bait stations or jam jars.
Quick Facts
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A single Yellow-Legged Asian hornet queen arrived in France in 2004, an accidental import from China
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The insect has since invaded many parts of Western Europe
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They were first discovered in the UK in 2016
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Between 2016 and 2022 there were 23 confirmed sightings in the UK, including 13 nests = 1-2 nests/year
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In 2023, 72 nests were found in 56 locations – more than three times the previous six years combined
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A voracious predator which poses a significant threat to honey bees and all native insects – it has no natural predators in the UK
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An average nest can consume over 11kg of insects in one year = about 1 million insects
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It has already altered the biodiversity in parts of France
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Their habit of hovering outside the hive stops the bees from collecting nectar and pollen to feed themselves
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Can now be found in 12 European countries
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Some make their way to the UK by flying across the Channel – other routes include via ferries, containers and vehicles
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We need eyes on the ground everywhere – in towns and cities, parks and woodland areas.... ports, marinas, garden centres, orchards, vineyards, parks, timber yards, fruit and veg wholesalers, transport hubs and gardens need to be extra vigilant.
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Yellow-Legged Asian hornets have been found on ferries, sailing boats, and in imported goods such as wood, soil and other horticulture products.
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Sightings should be reported as soon as possible, complete with an image if possible, via the Asian Hornet Watch app - available on the app stores for Android and iPhone
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The National Bee Unit (NBU) will then follow up reports and destroy their nests
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A single hornet is unlikely to cause injury if left alone
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They can become very aggressive if their nest is disturbed – keep a distance of at least 10 metres away
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There have been 2 confirmed sightings so far in 2025
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Asian hornets have a stinger up to 3.5mm long, and they can use it multiple times
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Primary nests are roughly 5 -10 cm in diameter. These can often be found in sheds, garages, porches, bird boxes, hedgerows and brambles, even vehicle engines – generally at a height of less than 10m
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Secondary nests are 60-80 cm across and built close to primary nests, usually within a distance of 100m. These are usually found in the tops of trees, but those built lower down are a danger to those who might accidentally disturb them; for example those in hedges, bramble patches, utility boxes etc. They can be very difficult to spot when concealed by vegetation.
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One nest can produce 350+ queens, some of which will begin new colonies the following year.
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Asian hornets present one of the biggest threats to UK honey bees and other pollinators in a generation
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Not to be confused with “Vespa mandarinia”, the Asian giant hornet, aka ‘murder hornet’. This, to date, has never been found in Europe.
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All our efforts are currently working towards eradication
Identification
Most bees or wasp-like insects that you see will be familiar to you. However the asian hornet is quite different.
The asian hornet's distinguishing features are:
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It is almost completely black and can be quite shiny.
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It has one big yellow band low down its body (thorax, 4th segment)
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It has bright yellow legs
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It tends to fly in a straight line.
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It has a very loud and low frequency buzz.
Below left is our native European Hornet, which is reddy-brown with a wasp-like yellow body.
Below also is our Giant Wood Wasp or Horntail, which is a harmless sawfly that looks fairly similar to the Asian Hornet. It can be up to 4 cm long and it has a loud, low frequency buzz. Its long ovipositor tail is used to lay eggs.
All the rest below are Asian Hornets. See more photos of similar species.
This Defra/APHA video is an excellent introduction - please watch it!!
https://www.youtube.com/watch?v=l1mLgrvoHzA
Courtesy of The Angling Trust
Nests
A fertile queen survives the winter hibernation and immediately looks for sugar to give her energy. She will then search for a good location to build a small primary nest in which she will eventually raise up to 100 worker hornets. This may take her 2 months. The primary nest is small, just like a small wasp nest, and likely to be low down in a shed, stable, garage or a loft - anywhere that a wasp nest might happen.
Around May, most of these workers will move to a new location within about 700m and build a much larger secondary nest, either high in the trees or down low in dense hedges or brambles. When it is ready, the queen will move to the secondary nest and continue laying, until the nest has around 6,000 worker hornets. All workers are non-fertile females. However, the queen will also create virgin queens and drones (males) that will eventually mate to produce some 350+ fertilised queens that can each potentially create a new colony the following year. No other wasp/bee insect in the UK builds nests like the secondary nests, so there can be no confusion.
Below are pictures of small primary nests and big secondary nests, so you can recognise them and report them. Secondary nests can be much larger than those shown here. Photos courtesy of BBKA.
Report it
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You can report sightings or a nest using the ‘Asian Hornet Watch’ app, which is available to download from Apple or Android Screenshots of the iPhone app below show what you can do.
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Members of the public can also report sightings by email to alertnonnative@ceh.ac.uk with a photo. Or report it online at https://risc.brc.ac.uk/alert.php?species=asian_hornet
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In addition, please report it to your local AHT by email at aht-coordinator@sdbka.org. Take a picture, share it by email saying where and when you took the picture and giving a mobile number so that the AHT can contact you.
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Further details on the appearance of an Asian hornet can be found on the Bee Base guide or the non-native species identification guide.
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This APHA Video shows an asian hornet in Portugal preparing a dead bee to take back to its nest.
What you can do
Anyone can help. Anyone can contribute. Anyone can join.
Using a bait station can attract any asian hornet within 700m or so.
Is your family or work place aware and prepared?
Identify it, if you can, before you report it
Report
Report it using the Apple app, the Android app or online as shown above
Collaborate with others in your community, at school or at work. Join our AHT volunteers who are taking the lead in several areas and groups
More information
The Asian Hornet, Vespa velutina, is a native species of Asia which was inadvertently introduced to South France in 2004. It has spread rapidly since then and is now widespread in France, Spain, Portugal and Belgium, and is moving into Italy. There were over 500,000 reported nests in France in 2023. There were more than 300 nests in Jersey.
Before 2023, only one or two nests were found each year in UK . In 2023, there were 151 confirmed sightings with 72 nests found and destroyed, mostly in Kent, but with 2 in the New Forest and 2 more near Plymouth. This is of great concern, since a single secondary nest in September can produce around 350 queens that disperse, potentially flying up to 50 miles, before they hibernate and the winter survivors emerge the next year to create a new nest with thousands of workers and up to 350 more queens to start the cycle again. Hence the rapid invasion. We have to destroy at least 98% of all Asian Hornet nests that exist just to maintain the status quo today. It's unlikely this will happen. The government view is that 2025 is probably the last chance we have to eradicate the asian hornet in UK. Most others believe that the asian hornet is probably already established and that we need to develop ways to minimise its presence and impact, but without causing more problems ourselves.
The Asian Hornet is a voracious predator of other insects, feeding on the protein in their thorax, and is a danger to our native insects. An Asian Hornet colony will typically consume 12 - 25 kg of insects in a year, so even a single colony can have a severe impact on the local insect population, and hence to flowers, birds and the whole local ecosystem. Colonies of honey bees are a particularly attractive food source to a mature Asian Hornet colony in late summer or autumn, when evidence from France indicates that honey bees are more than 50% of the hornets' prey. Colonies can be rapidly destroyed by this predation. Even when their predation is unsuccessful, whether on honey bees or bumble bees etc, the pressure and intimidation discourages bees from foraging and the overall hive's health to decline such that they are less likely to survive the winter.
We have to collaborate across the country to manage the situation. SDBKA is running community presentations and workshops to raise awareness and understanding as fast as possible. We need volunteers to help monitor. Ask for a presentation for your community. Email: aht-coordinator@sdbka.org
