how do you get rid of them
Here are some things you can do:
Get chickens! Keep chickens or guinea hens. They eat loads of grasshoppers and will save your garden from destruction. Many cities and towns allow keeping these birds with permits.
Hot pepper wax insect repellent is the key. It's in all the garden catalogs. Insects can't stand the taste, and therefore do not eat the leaves! And it's natural.
There's a product called "Ecobran" that is a grasshopper bait containing a fungus that only affects grasshoppers and their close relatives. It doesn't affect other insects or birds. ecobran.com
Yesterday I found a crop of black and yellow grasshoppers on my bromeliads. This morning they were headed off toward my vegetable garden. I didn't find much help on the internet but this is what I did. I took 1/4 cup of vinegar and two tbs. of Dawn dish soap and sprayed the little suckers. It didn't kill them but it slowed them down long enough for me to squash them all. Good luck. Power to the farmers!