"Quercus Castelo Branco has received many contacts and requests for help from cities in the past two months to identify possible situations with the presence of Asian wasps in the district", said the organisation, in a statement sent to Lusa News Agency.

The Asian wasp is a non-indigenous species and a predator of the European bee.

The Asian wasp also can create problems for public safety. If it senses the threat it reacts quite aggressively, including pursuits up to a few hundred metres.