Hornets are known as the largest eusocial wasps. These insects belong to the Vespidae family. Some of the species reach up to 5.5 cm in length. The best known species are the European hornet, or, Vespa crabro that grow to a length of about 2 to 3.5 cm and are widely distributed throughout Europe, Russia, North America as well as North East Asia.
Hornet nests are composed of a paper like substance that is derived from the saliva and wood pulp. The nests are mostly located within or atop trees, under a deck, in the ground and in the walls.
Ground hornet nests are usually inaccessible and cannot be removed easily. The hornets mostly build their nest in rotted tree stumps and spaces in walls or ceiling. Pour a solution of soap and water into the nest entrance, this kills the hornets and thus, you can easily remove the nest.
If you have got a hornet’s nest under the deck, it is advisable to get an exterminator to get rid of it. But, if you want to do it yourself, then the best way is to get fully protected before approaching the nest.
The best time would be at night, as hornets are less active during the night and prefer to be in their nests. You could simply use a gas spray and kill the hornets; this will help you to get rid of the nest easily without any hassle.