Asian hornet

Appearance

Vespa velutina is significantly smaller than the European hornet. Typically, queens are 30 mm in length, and males about 24 mm. Workers measure about 20 mm in length. The species has distinctive yellow tarsi (legs). The thorax is a velvety brown or black with a brown abdomen. Each abdominal segment has a narrow posterior yellow border, except for the fourth segment, which is orange. The head is black and the face yellow. Regional forms vary sufficiently in color to cause difficulties in classification, and several subspecies have been variously identified and ultimately rejected; while a history of recognizing subspecies within many of the Vespa species exists, including V.velutina, the most recent taxonomic revision of the genus treats all subspecific names in the genus Vespa as synonyms, effectively relegating them to no more than informal names for regional color forms. The color form causing concern about its invasiveness in Europe has been referred to as V.v.nigrithorax,{{ cite web |title= European Alien Species Information Network - Species Explorer - Species Factsheet - Vespa velutina nigrithorax |url=https://easin.jrc.ec.europa.eu/spexplorer/species/factsheet/R15970 |website=europa.eu |access-date=2023-12-30 }} though this name no longer has any taxonomic standing.

Biology

Like other hornets, V.velutina builds nests that may house colonies of several thousand individuals. File:Paula Jorge - vespas.jpg|V. velutina nest on tree File:Vespa vélutina.jpg| V. velutina nest File:Nid de frelon asiatique (Vespa velutina) -3.jpg|Inner structure of nest File:Vespa_Munsiyari.jpg|V. velutina from the Central Himalayas, India

V.velutina opportunistically hunts a very wide range of insects, including flies, dragonflies, and Orthoptera, typically capturing them by pursuit.

Predation on honeybees

The major concern about their invasiveness, however, is that when they find a honey bee colony or an apiary, they tend to settle down and specialize in honey bees as their prey, as do the larger Japanese giant hornets. A hornet occupies a position above a beehive as its hunting territory. It flies about within an area of about 1/2 m2, scanning the direction from which foraging honey bees return to the hive. Each hornet vigorously defends its hunting territory, chasing off any rivals. However, as soon as it catches a bee, it flies off and another hornet replaces it, usually within a few seconds. The circadian activities of the two species are similar, and the hunting hornets match them; their most intense activity is in the morning and afternoon, not near dusk or noon.

In its native range, V.velutina mainly hunts Apis cerana, the eastern honey bee, which has evolved a strategy of avoiding hovering hornets by rapid entry and exit from the hive when hornets are about. The guard bees also ball hornets to death. However, where A.mellifera, the western honey bee, has been imported, V.velutina finds them easier prey than A.cerana, because A.mellifera has not been subjected to selection for countering concentrated hawking by hornets. For example, A.mellifera approach their hives more indirectly and slowly when they detect hawking hornets, instead of darting in as fast as possible in the way that A.cerana does. They also ball hornets, but less effectively, and they do not achieve as high a temperature in the ball. Furthermore, when they detect that hornets are hawking, A.cerana tend to withdraw into the nest, but A.mellifera do not.

A.cerana guard bees also use wing shimmering in response to the presence of V.velutina. This has variously been suggested to be an aposematic signal or a strategy for disruption of visual patterns, similar to the behavior of Apis cerana nuluensis and Apis dorsata, but instead has been shown, in conjunction with rocking, to be endothermic heat production in preparation for a ball attack on the hornet.{{cite journal |doi-access=free}} Whilst A.mellifera, also ball attack hornets, they exhibit no such endothermic heat production behavior, and when A.mellifera occurs together with A.cerana, the hornet V.velutina preferentially hawks A.mellifera foragers.

Distribution

V.velutina originates from Southeast Asia, particularly the tropical regions, from northern India, Pakistan, Afghanistan, Bhutan, China, Taiwan, Burma, Thailand, Laos, Vietnam, Malaysia, the Indo-Chinese peninsula, and surrounding archipelagoes.

Pest status and invasiveness

As an invasive species, the Asian hornet appeared earliest in France, Spain, Portugal, South Korea, and Japan. Further invasions are ongoing in various countries, including much of Europe. Humans have been attacked after disturbing hornets; although the species is not aggressive, it "charges in a group as soon as it feels its nest is threatened". People have been hospitalised in France after suffering anaphylactic shock as a result of multiple stings. Because of Asian hornets' larger size, their stings are more serious than those of western honey bees. In November 2017, a man was killed in Galicia, Spain after being stung over 20 times while pruning an apple tree. Several people have died in south west France near the original introduction site, including a resident of Chaillevette, Charente-Maritime, a 60-year-old woman in Gironde, Nouvelle-Aquitaine in 2019, and a farmer in Orival, Charente in 2020. There were nineteen confirmed Asian hornet sightings in England between 2016 and 2020, including ten nests, all of which were destroyed.

The Asian hornet has been reported as naturalised on the Japanese island of Tsushima since about 2010.

In Europe, the Asian hornet is included since 2016 in the list of Invasive Alien Species of Union concern ("the Union list"), meaning that it cannot be intentionally imported, kept, bred, transported (except for purposes of eradication), offered for sale, used or exchanged, permitted to reproduce in any way, or released into the environment, in the European Union.

In August 2023, the Georgia Department of Agriculture, in coordination with the United States Department of Agriculture Plant & Animal Health Inspection Service and the University of Georgia, confirmed the presence of a yellow-legged hornet near Savannah, Georgia. This is the first time a live specimen of this species has been detected in the United States. This was followed by the first report of the species from South Carolina in November 2023, and the discovery of nests in 2024.

Climate change may increase invasive success of the yellow-legged hornet in northern Europe and the US due to increased temperatures, although warmer temperatures are not necessary for the establishment of this species in these regions.

Timeline of spread across Europe

V.velutina has become an invasive species in France, where it is believed to have arrived in boxes of pottery from China in 2004. By 2009, several thousand nests were in the area of Bordeaux and surrounding departments, and by the end of 2015, they were reported over most of France.

The Asian hornet spread to northern Spain, as confirmed in 2010 by the Beekeepers' Association of the Basque Country (Gipuzkoako Erlezainen Elkartea) and the Neiker entomology institute in Irún, after breeding colonies were found. In September 2013, a beekeeper from Rasines, Cantabria, documented the hornets' presence in two specimens. In June 2015, firemen destroyed a nest in Santander.

It was first reported in Portugal in 2011. The first observation in southern Belgium was also reported in 2011. By 2017, the species had spread across the country.

It was reported in Liguria, Italy in 2012. According to Italian Beekepers' Association in 2017, the Asian hornet was well established in northwestern regions of Italy, and colonization is steadily advancing.

The Asian hornet was first sighted in Germany in 2014. Following a series of warm and dry summers, the population tripled between 2021 and 2022.

The first sighting on the UK mainland was announced on 20 September 2016 and occurred near Tetbury in Gloucestershire; the nest was found and destroyed and no breeding adults were found within. A nest was reported on the Channel Island of Alderney in 2016. In 2023, 72 nests were discovered. By 2025, the species, considered a "significant threat" to honeybees and other pollinators, were being tracked using transmitters to find nests.

In 2017 the first observation the Netherlands was recorded in Zeeland. In 2023, V.velutina was reported in all provinces.

In 2020, the first record for Luxembourg was reported.

In 2023, it appeared in Hungary, the first ones were captured near Kimle.

In 2025 in Ireland a nest was discovered in Cork city.

New Zealand

In 2025 in Auckland, New Zealand nests, queens and males have been found. The first detections were of two "old and slow" males found in winter in the suburbs of Grafton and Albany. On 17 October, a queen was found in Glenfield, in the process of building a nest. The public were encouraged to look out for the hornets, and by 12 December, 36 confirmed queen hornets had been found, with many in the process of nest-building. On the 11 December, the watch zone was extended from 5km around Glenfield and Birkdale, to 11km. Elements of the biosecurity response include a public education campaign, a variety of traps and lures, electronic tracking of worker hornets, and ground surveys and property inspections by Biosecurity New Zealand.

Biocontrol

Biocontrol of Vespa velutina has been attempted using Sarracenia purpurea - the purple pitcher plant. Pitcher plants are natural bottle traps. Both of these are invasives in France and pitchers were found to be naturally catching hornets, and so were investigated as a biocontrol. However Sarracenia purpurea has been judged too unselective to use after closer study. The endoparasitic fly Conops vesicularis has been found to attack V.velutina queens in France, preventing the affected queens from establishing colonies. In South Korea, two species of Xenos (Strepsiptera) have been found to parasitize the yellow-legged hornet. Scientists in Spain found a European honey buzzard had predated on hornets as soon as they reached its territory, showcasing the potential of this predatory bird as a way to mitigate the invasion.

Human consumption

According to a 2020 study in Korea, the larvae of Vespa velutina could be a potential food source, similar to the larvae of the Asian giant hornet (Vespa mandarinia), which are a Japanese delicacy.

Gallery

File:Vespa velutina up.JPG|V. velutina - usual color variant, dorsal aspect File:Vespa velutina side.jpg|V. velutina - usual color variant, lateral aspect File:Vespa velutina MHNT.jpg|V. velutina color form nigrithorax, dark color variant - Toulouse File:Sarang Tebuan Haji.JPG|Nest of V. velutina about 30 feet up on a durian tree in Malaysia File:Vespa velutina nigrithorax MHNT dos.jpg|Mounted specimen File:Vespa Veutina - Filippo Turetta.jpg|Female of V. velutina, private collection, F. Turetta

References

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