Attack pheromone
Hornets, like many social wasps, can mobilize the entire nest to sting in defense, which is highly dangerous to humans and other animals. The attack pheromone is released in case of threat to the nest. In the case of the Asian giant hornet (Vespa mandarina) this is also used to...
Supercharged waspy ********....get them in the garden quite often, and have had a few nest in the shed. I find a badminton raquet does the job when they're in flight.