I don't have the book to hand, so I can't give the I exact instructions, but before I have used certain plants like natural tobacco that the pests can't eat, boiled down and left to steep in water for a month or more and then diluted and sprayed around the plants. I don't know if it would work against grasshoppers, because most of the pests I have here in England are a lot smaller, but it worked against caterpillars when I had a similar problem with them swarming I crops. I still had to wash them off with water and pick a few off, but the tobacco preparation kept them away after that.
Blessed love
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