I ran across this article and thought you might want to check it out. Below is an excerpt followed by the link.
A third or better alternative suggested by Trisha Shirey, grounds manager At Lake Austin Spa Resort in Austin, Texas, is to get rid of grasshoppers the eco-friendly way or stop them from eating your plants by using ordinary all-purpose flour.
Yes, ordinary all-purpose flour. When grasshoppers (or any other chewing insects such as blister beetles) feed on foliage that have been dusted with flour, their mouths get all gummed up, and the grasshopper cannot eat any more. Furthermore, when they swallow a whole lot of this flour, they get sick and stop eating all together.
(NOTE: You must be careful, though. To get rid of grasshoppers the eco-friendly, use ONLY the old-fashion all-purpose type of flour because the self-rising flour has salts in it. These salts may ruin your plants, and salt is not good for the soil.)
http://pestcontroloptions.com/...