A very reasonable idea, and one used for mosquitoes, is to breed and release a cloud of dragonflies.
Dragonflies are voracious predators of other insects and will clear an area very quickly. They also make a very quiet clicking sound that other insects are terrified of.
In Canada, they tried this in a park infested with mosquitoes, just before a major outdoor concert. In just a few days, the mosquitoes were completely gone.
The only thing to figure out is how many dragonflies per acre you need.
Note to self...Maine off vacation list.
They come, stay a few weeks, and then they go.
Quick, everyone run around waving their hands and screaming.
I swear, we need a good typhoid outbreak to dynamite people into some perspective.