Okay, I'll play along even though the most cursory Google search has tons of hits:
"Verify: Are half of California farmworkers undocumented?"
https://www.abc10.com/article/news/local/verify/verify-are-h...
Deporting illegal workers is causing farm workers to finally be above minimum wage:
"Wages rise on California farms. Americans still don’t want the job"
https://www.latimes.com/projects/la-fi-farms-immigration/
I chose those two articles because they are quite a bit more "pro-immigration" than others and most likely to blunt the knee-jerk "Yer a raciiiiist!" idiots.
The real problem is that rather than deporting all these people we should be hitting the agribusinesses with gigantic fines and jail time for exploiting them in the first place. If some CEOs wound up in jail for employing undocumented workers and not paying minimum wage instead of just getting a slap on the wrist, this problem would self-correct.