From CNN:

The agricultural industry in the United States could face a crisis if the country doesn't find a way to attract more legal farm workers from abroad soon. That's one of the conclusions reached Wednesday at a congressional hearing.

The House Subcommittee on Immigration Policy and Enforcement met to evaluate a migrant farm-worker visa program frequently used by Mexicans to legally work on farms and ranches across the United States. The H-2A visa program was created for that purpose back in the late 1980s.

Rep. Elton Gallegly, R-California, in his opening remarks as chairman of the subcommittee, said, "There are simply not enough Americans willing to do, to take the jobs of migrant farm workers. In fact, our government's policy for generations has been to remove Americans from such labor."

For more, see: Rep: U.S. faces agriculture 'crisis' without farm-worker visa reform