[MadnessASAP]

A countries agricultural base being dependent on undocumented migrant workers is bad and should be corrected. However simply deporting all the migrants overnight with no further action doesn't fix the underlying problem, doesn't help the industry, and doesn't help the consumers.

All things being equal, people will generally choose to follow the law. So figure out why the migrants and their employers are choosing not to follow the law and fix that.

[rdm_blackhole]

You could do like Australia, offer a working-holiday visa with the possibility to renew it for up to 3 years on the condition that you spend a certain amount of time working on a farm/ in rural area.

Loads of people do it in Australia and it helps tremendously. It's not perfect for sure, but it's something.