The Yellow Legged Asian hornet (formerly known as the Asian hornet,) (Vespa velutina), is an invasive non-native species from Asia. YLHs cause significant environmental damage and sightings should be reported to the Non-Native Species Secretariat (NNSS) as soon as possible.
Numbers of this destructive insect are rising rapidly with over 300 sightings, and 80 nests destroyed this season so far.
YLHs are most active between April and November (peaking in August/September) and are inactive over the winter.
If they get established in the UK it is predicted they will have a devastating impact on our insect population and ecosystem.
The YLH can be accidentally imported into the UK among goods such as soil with pot plants, cut flowers, fruit, timber, animal feed, and even used camping equipment.
We all need to stay vigilant, so if you have connections with local gardening groups, anglers, garden centres, wildlife groups, ramblers etc, please spread the word.
If you think you can help raise awareness in your company, your hobby groups, your school, put up posters in your neighbourhood, give talks, or invite a beekeeper to give a talk please contact us.
The NNSS provide a series of resources free of charge including posters and identification sheets which you can distribute to others.
Asian hornets are rather like large black wasps with a single yellow band, orange face and yellow tipped legs. Queens are up to 30mm long, workers up to 25mm.
Look out for:
black thorax
abdomen mostly black except for an orange fourth segment
legs brown with yellow ends
head black with orange-yellow face
Queens buzz quite deeply, like a bumblebee
If you think you have seen an YLH, the quickest and best way to identify and report a possible sighting is to use the Asian Hornet Watch app which has been designed to record and help the early detection of YLHs. The free app provides an identification guide to help check which species you have seen and an opportunity to record your sightings.
Alternatively, report the sighting to the Non-Native Species Directorate with a photo using the online form: www.bit.ly/asianhornetreport or email a photo to alertnonnative@ceh.ac.uk.
If you catch a YLH in your monitoring trap, photograph it, report it, then put the whole trap in the freezer to kill it without squashing.
If the sighting is positive, the NNSS will trigger further investigations by the UK's bee inspectors.
Beekeepers are being called on by the BBKA to familiarise ourselves with the the BBKA Resources page. Here you'll find social media links, identification information for yourself, and helpful posters to pass onto others. You'll find the links to the app, videos of YLHs, life cycle posters, and instructions for making traps.
The National Bee Unit page includes useful links to posters, id sheets, information about life cycle, and key identification features versus the native European hornet. Visit the NBU resources page.
Roy Fairclough is the EBKA YLH Action Team co-ordinator. See the Committee page for his contact details.
Asian Hornet
Comparison chart
European Hornet