Grasshoppers destroyed my winter garden
I'm gardening vegetables for the first time. I planted seeds of winter crops in September and early October in a 10x40' plot of 50/50 clayish native soil and compost and for a while I was very optimistic. Beans, peas, cilantro, onions, various greens were coming up fine. Then, about two weeks ago, grasshoppers started to appear in the yard - it turns out that they love almost everything in the garden and have chewed most of it to the ground. Arugula, beans, peas, and cilantro were spared but the onions, mustard greens, broccoli, cabbage, kale and chard seem to be completely destroyed.
Is there anything I can do to get rid of these pests? Is there any hope for salvaging this garden? I'm in the Phoenix area.