What kills hornet instantly?

What kills hornet instantly is similar to what kills hornets, including physical crushing, chemical sprays, and soapy water that cause rapid death on contact, though safety precautions are needed as hornets defend nests aggressively and can sting multiple times. The fastest way to kill hornet instantly is physical crushing with fly swatter, shoe, or rolled newspaper that crushes hornet immediately, though this should be done carefully to avoid being stung and can provoke other hornets if near nest due to alarm pheromones that attract colony to defend. Vacuuming with strong suction removes hornet instantly and contains it, though hornet may not die immediately inside vacuum but will be trapped. Chemical methods that kill instantly on contact include insecticide sprays labeled for hornets containing pyrethrins, pyrethroids, or wasp and hornet freeze sprays that kill on contact within seconds when sprayed directly, and these sprays often shoot up to 20 feet allowing safe distance from nest. Soapy water solution made of dish soap and water kills hornets quickly by clogging breathing holes called spiracles and causing suffocation, as soap breaks surface tension, killing within minutes. Boiling water kills instantly when poured on nest but is dangerous and not recommended for DIY. For large nests, professional pest control that applies insecticidal dust is most effective and safe. However, hornets are beneficial predators eating pest insects, so killing should be reserved for nests that pose danger near homes.