Prevent grasshoppers by keeping your grow areas clean and free of debris, and especially grass, because this is their preferred hiding location.
Nets around the perimeter of the grow area can help with keeping grasshoppers away from plants at all stages of life.
Maintaining a population of predatory birds can help with reducing the number of adult grasshoppers such as blue jays and sparrows, among other species.
Organic sprays such as neem oil or spinosad on the plants or soil will kill grasshoppers with prolonged exposure.
Every season before growing, the soil can be turned over or treated with predatory nematodes to destroy eggs that may have survived over the winter.