Flying insects are not necessarily impossible to control. You can promote the populations of their predators.
The problem is, that usually requires promoting a mixture of amphibians, birds, reptiles, small mammals, and other insects. To do that, you need a habitat full of various plants, trees, and terrains, but vast swathes of land have been turned into dead monoculture, so the predators die out.
Dominance over the definition of the word dominance even