Good. These are some of the worst paying jobs in the country.. because they have used migrants to solve their labor problem, removing the need for them to compete for workers. They need to raise their wages, pay what it really costs for labor. And as a bonus, the increased costs will provide an incentive for future automation.
I don't entirely disagree but I also suspect that many Americans would be shocked by the cost of food if workers were paid higher wages (especially if it was done for everyone who touches your food as it travels from the farm to the table) and that most farmers would prefer a phased approach to reform so that crops aren't rotting in the fields.
I think everyone would prefer that.. but this is a problem the farmers created themselves. They've been using migrants for so long, that they've created a substantial difference in pay between themselves and the rest of the labor market. And with a sudden change in the supply of migrants, they're now trying to figure out what that difference is--what the true cost of labor is for their industry.
If they never relied on migrants, they would already know the answer to this question.