The municipality reports that 1,174 nests were signalled, 269 of which were destroyed by burning and 528 inoculated with insecticide.
As of August 2021, a new methodology of intervention in the nests was adopted, which was carried out through the application of insecticide, abandoning the burning process.
"It was possible to increase the capacity, speed and effectiveness of interventions and correspond to the volume of nest communications," reads the information from the municipality.
Until the end of January, it adds, the platform for reporting Asian hornet nests is temporarily closed, but the intervention teams remain operational, "for cases of urgent resolution".
The first signs of the species' presence in Portugal appeared in 2011, but the situation only worsened from the end of the following year.
The vespa velutina is an Asian species with a natural distribution area across tropical and subtropical regions from northern India to eastern China, Indochina and the Indonesian archipelago.