Grain Fly
this insect pest was native to the planet Sacorria, where it consumed huge amounts of harvested grains. As if the destruction of crops wasn't enough, the grain fly also delivered a painful bite when attacked. Since the grain flies always traveled an swarms, any being caught by the swarm suffered many bites at one time, and was often renedered unconscious from the pain. Extermination of the grain fly population was given the go-ahead when xenobiologists learned that the grain fly existed without interaction with any other species on the planet. However, getting rid of these pests proved easier said than done.