Or the farmers will go out of business -- which is the real answer. Many can't afford to pay "unemployed LEGAL workers." An ugly fact of life.
The main cause of illegal immigration is not that these people cross the border, but that there are Americans who hire them.
So let them find another line of work. Bad enough they get billions in taxpayer subsidies, without steering our country toward Third-World-toilethood so they can stay in business.