... they must be controlled because they will eat the crops of farmers.

Looked at it from our perspective some insects might be 'pests', but as every other organism they just try to survive and reproduce themselves. However, the real vermin of this planet is called Homo sapiens as he pollutes water and air, destroys the forests, produces plastic, emitts nuclear waste and leads wars ...

Birds will do that job for us in the other hand :D

I think we humans should add more insects to our menu, too, as they are very healthy (full of proteins), numerous (with a high available biomass) and easy to farm.