Few American industries are as invested in the decades-long political battle over immigration as agriculture. Paying low wages for backbreaking work, growers large and small have historically relied on immigrants from south of the Rio Grande. These days, over one-quarter of the farmhands in the United States are immigrants working here illegally.

This is how the growers will respond to President Trump’s threatened crackdown on immigration: They will lobby, asking Congress to provide some legal option to hang on to their foreign work force. They will switch to crops like tree nuts, which are less labor-intensive to produce than perishable fruits and vegetables. They will look for technology to mechanize the harvest of strawberries and other crops. And they will rent land in Mexico.

There is one thing they won’t do. Even if the Trump administration were to deploy the 10,000 immigration agents it plans to hire across the nation’s fields to detain and deport farmhands working illegally, farmers are very unlikely to raise wages and improve working conditions to attract American workers instead.