Does killing a hornet attract more hornets?

All social wasps emit an alarm pheromone from their bodies at the point of death, signifying loud and clear to any other wasps in the vicinity that there is a threat nearby. read more

All social wasps emit an alarm pheromone from their bodies at the point of death, signifying loud and clear to any other wasps in the vicinity that there is a threat nearby. This is why it is very dangerous to kill a hornet near its nest, as the alarm pheromone could very well summon the entire colony to the dead insect. read more

Unlike bees, female wasps have the ability to sting a target multiple times because their stinger does not fall off after use. Social wasps and honeybees both use pheromones, secreted or excreted chemicals that trigger a social response in members of the same species. read more

If the wasp is a loner and you injured it,no others will come to the rescue but if there's a nest nearby there will be quite a lot that will come and they might not know who or what hurt them but they would probably suspect you. Take a look at this link it will tell you more about wasps. read more