Here in the Southeast, we have a gawd-awful HUGE grasshopper called the Eastern Lubber.
They're poisonous, so they have very few predators to keep them in check. Killing them in a safe way is nigh impossible. You can step on them when they're too big and fat to hop away, but by then they've decimated the garden.
Quick life cycle lesson on these demons--the mother lays her eggs inside the soil in late summer/fall. The eggs overwinter in the soil, and the young emerge out of the ground in droves. It's gross. And of course, you can rest assured the mama laid her eggs right in the middle of your best ever cucumber patch. Which means her babies are right there ready to feast on your lovely transplants the minute they emerge.
However, I found a non-chemical way to kill these beasts--a propane torch! Yes, you kill off your best cukes, but hey...those vermin gotta go!!! I have other transplants ready to take their place.
Ya gotta burn those little suckers the very minute you see them coming out of the ground. But you'll see them, because they come out in droves...like a plague. Burn 'em to stop the life cycle. It might take a few sessions of stalking your property with that propane torch, but in a few weeks, your grasshopper population will be much lower.
And you didn't use poisons to get rid of them. And you got to play with a flame thrower!