When faced with yellow-legged hornets, adopt the right reflexes

At the end of summer, the yellow-legged hornet (Vespa velutina) is once again particularly active. On the one hand, individual insects of this species may be found feeding on the flesh of ripe fruit (apples, plums, grapes, etc.) and the flowers of climbing ivy. On the other hand, during these weeks, the colonies also rear their queens for the following season. The yellow-legged hornet, also known as the Asian hornet, is an invasive alien species (IAS). The Nature and Forest Agency is asking the public to report nests, as this species needs to be controlled to limit its spread and reduce the damage it causes to native species.

Report nests, but never remove them yourself

A nest of yellow-legged hornets can contain more than 2,000 individuals. To avoid being stung, it is important to stay away from nests. Although not aggressive by nature, yellow-legged hornets may feel threatened if you approach their nest. This could lead to a potentially dangerous attack, as in defending the nest, it is likely that a large number of individual hornets will attack a single person. Under no circumstances should nests be removed on your own initiative. The first step is for a specialist to identify the species and then professionally remove the nest. Therefore, it is necessary to report any nests discovered, with a photo and their location, to neobiota@anf.etat.lu or using the iNaturalist application.

How to identify the yellow-legged hornet?

The yellow-legged hornet has a black head with a yellow-orange front, a dark brown to black body with only the fourth section of the abdomen yellow and black legs with yellow tips (tarsi). In the European hornet (Vespa crabro), on the other hand, the body and legs are reddish and the abdomen is predominantly yellow.

The stings are no more dangerous than those of European hornets

During the grape or fruit harvest, isolated specimens of the yellow-legged hornet may be spotted as they feed on the fruit. In these cases, there is a risk of stinging if a hornet feels threatened.

The sting of the yellow-legged hornet is no more dangerous or painful than that of the European hornet. In most cases, a sting is harmless. If complications arise from a sting, it is advisable to consult a doctor. The pain can last up to 6 days.

In very rare cases, a sting can cause a severe allergic reaction (anaphylactic shock). If you notice any signs of anaphylactic shock (sudden drop in blood pressure, hives, nausea and vomiting, shortness of breath, rapid or weak pulse, etc.), call 112 immediately.

For more information, visit www.emwelt.lu or contact the ANF at neobiota@anf.etat.lu.

Press release by the Nature and Forest Agency and the Ministry of Health and Social Security