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."