I experienced the worst grasshopper invasion I've ever heard of in norcal during the drought.. the only two things that worked for me. ( and believe me I tried everything). NOTHING ELSE WORKS I PROMISE
1. "NOLO BAIT" it's the best product out there hands down. Grasshoppers are very resilient creatures you can not poison them it doesn't work. "NOLO BAIT" baits them in, they eat the bait, within two weeks no more grasshoppers.
2. Take a bunch of milk jugs or any jugs for that matter and cut them so that you can put bird seed in them tie them to fences or just set them in your yard, just be prepared for th e bird invasion...
Hope this helps