The modularity of inlet sizes enables more selective trapping. For example, the 9 mm (0.35 in.) diameter allows you to trap both Asian hornet foundresses and workers, for spring trapping.
On the other hand, for summer/autumn trapping, if you want to be even more selective, you can reduce the diameter to 8 mm (0.31 in.) (or even 7 mm (0.27 in.) - test and increase to 8mm (0.31 in.) if you don't see any catches) to target Asian hornet workers and avoid catching European hornets.
Don't forget that hornets are invasive species: Vespa orientalis (the Oriental Hornet) was spotted in 2021 in Marseille and could spread to other départements in the years to come. With the VespaCatch Select trap, you can capture it by setting the diameter to 10 mm (0.39 in.).
Similarly, Vespa mandarinia (the giant hornet) has already been spotted in the USA and Canada. We hope never to welcome it to France, but believe that everyone should have a trapping system ready, for the day when these new species arrive in your apiaries or gardens. For this one, the diameter of the lid alone (11 mm) (0.43 in.) should enable it to be caught.
With just one trap, you can catch all the flying pests that threaten your hives and green spaces.