As someone that has raised cattle, hogs and chickens; grown vegetables as a cash crop; and participated in the commodities market it is obvious to me that you don’t have a clue about what is required to be a common laborer “on the farm.”
I could take your average retail or hospitality worker and have them dead of a heat stroke within an hour. That is if I could get any of them to show up for work. And I know from my own experience that getting them to show up is usually impossible. When someone tells you that “there are jobs Americans just won’t do” believe them. I know for a fact it’s true.
Yes, at $3-7/hr, that is correct. And there are plenty of people who don’t want manual labor or work in the sun. But the people working landscaping and (low skilled) construction for $10-30/hr (and there are millions) are the same people that could work the farm and many people in retail/restaurants/hospitality would gladly swap an $9/hr job as a cashier/dishwasher/etc for $15/hr FT working on a farm (certainly not, or even a majority).