Part of HIS job is to set a salary that will attract sufficient labor. Looks like a poor immigration strategy had been subsidizing the poor business practices of a (soon to be) poor businessman. Adapt or die.
FOURTH GENERATION or this farm, That would be around a 100 years, so he knows the financial story far better than anyone else here.
You response is accurate, but incomplete.
He is forced to compete with other farmers who aren't hassled about the status of THEIR workers.
The solution is to enforce the immigration laws evenly.