A giant net and you could at least eat them after they feast on your crops:

https://en.wikipedia.org/wiki/Locust#As_food

There is no more ferocious predator than humans. If they became a delicacy all over the world they wouldn't stand a chance in hell.

According to the wikipedia article: "Locusts yield about five times more edible protein per unit of fodder than cattle, and produce lower levels of greenhouse gases in the process."

I always wondered why they're not collected and fed to chickens. Seems like a flock of fowl of any kind would gorge on these juicy bugs. Even a small inset net should harvest a good amount.

Yeah, a good source of protein, with the huge numbers a challenge would be drying and storage

You probably already have equipment to dry and store the grain.

Reuse of the same equipment to dry the insects might be doable.

Wow, these stuff are beasts ! They look enormous !