Problem as identified by the Oregon Department of Agriculture:
It is estimated that 50 percent to 70 percent of the workers may be undocumented for legal residence in the US. However, because growers must accept any documentation presented to them that appears legal or face discrimination lawsuits, the workers are employed. Even with the ability to check Social Security numbers, it is difficult to determine legal status.
(I am assuming that they consider crime to be a problem)
As noted in the Capital Press photo of the cucumber picker, mechanization is being accelerated due to labor costs and availability concerns. Similar machinery is available or being developed for asparagus, caneberries, wine grapes, and other crops. While fresh market produce—which brings a higher premium than products destined for processing—may retain more hand labor, much of the production will shift to mechanization in coming years as global forces continue to grind away at agriculture’s ability to remain profitable.
And there you have it. We will replace illegal aliens (in the fields) with machines. So where does that leave our illegal aliens that are picking berries? They are unskilled, uneducated and are criminals... I know, let's give them amnesty because I'm sure they have a lot to contribute to our society.