entomology is a fascinating field. i have taken a few courses in ento and currently work in a field where i'm required to make insect identifications based on sequencing of COX genes.
i have a friend who spent years developing and researching parasitic flies that attack fire ants. the one he finally chose is a tiny wasp that lays a single egg that, when it hatches, ends up decapitating the ant
New weapon turns fire ants into headless zombies - ABC News
the part that took forever - for good reason - was assessing whether these flies would attack domestic [i.e., 'good' ants] and end up being more of a problem than a solution.