With that much acreage, you could try crop dusting. The great part about the disease is that it won't harm livestock or anything, and the disease spreads with the grasshopper migration, so in theory a much greater area of control is acheived than just the treated areas. I treated 2 acres and the area around our house and garden soon had 90 to 95 percent fewer grasshoppers. There were also fewer in the pasture, even 100 yards and more away from the treated area.
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Dave
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