Following suspect sightings, on Sunday 24th September the National Bee Unit (NBU) received two photographs from a beekeeper in Woolacombe, North Devon, of an Asian hornet (Vespa velutina). The following day, the 25th September, preliminary surveillance began in the apiary and the NBU's Contingency Plan was activated. The local Bee Inspector monitored the apiary and initially found surveillance difficult due to the position of the colonies in the apiary. However, that morning, the Inspector managed to capture a hornet and sent the sample to the NBU in Sand Hutton for formal identification. Later that afternoon, the Inspector returned to the apiary site and a further 7 hornets were seen hawking in front of hives, but no line of sight could be ascertained, to establish a flight path back to the nest.
On the 26th September, South West Region inspectors were deployed to intensify searches for Asian hornets hawking in the area. Wet, misty and murky morning weather conditions were not ideal, but the Inspectors continued to survey the original outbreak apiary and two lines of sight were established. Inspectors were able to identify a second apiary site about 1km from the original outbreak, where one hornet was seen hawking for returning foraging bees. A hornet sample was taken, in order to establish if the hornets visiting the second apiary site were from the same nest and thus determine if there were multiple nests in the area.
Hornets were also observed in an apiary at a further site and were seen flying in a similar line of sight. The lines of sight from both the outbreak apiary and the second apiary combined were enough for an initial triangulation to be taken and investigated. The Inspectors began investigating public footpaths and the area around where the lines of sight met at the triangulation. A great deal of Asian hornet activity was observed at a nearby building site and on 27th September an Asian hornet nest was discovered.
The nest was destroyed the following evening, removed and taken to the Fera lab (Sand Hutton, York) on Friday 29th Sept. Further surveillance was carried out within a 10 km zone of the nest site and no further Asian hornet activity was detected. Following analysis of the nest has shown that none of the adult hornets were male and this indicates that the nest was detected and removed before the production of queens which will have gone into winter and then produced nests in 2018.
Additionally, if you are interested in finding out more details of the Tetbury outbreak in 2016, including genetic analysis of the hornets origin, this can be found in the PLoS One publication: Budge GE, Hodgetts J, Jones EP, Ostoja Starzewski JC, Hall J, Tomkies V, et al. (2017) The invasion, provenance and diversity of Vespa velutina Lepeletier (Hymenoptera: Vespidae) in Great Britain. PLoS ONE 12(9): e0185172.
Reproduced from National Bee Unit,
22nd December 2016