If farmers are unable to attract enough workers, they need to offer better wages. That's how a free market economy works.
Look at your last sentence, then look at mine. You beat me by four seconds. Dang!
Where are they gonna pass the cost of that increase to? The consumer? HAH! Thats a laugh. The places they sell to will tell them to screw off in a second and buy from another country.
You see son..farmers, like loggers are on the bottom of the heap. They cant pass their cost onto anyone as their aint NOBODY to pass it on to.
A company can only increase wages if they can also raise prices without losing market share. Otherwise profit is reduced. If profit is reduced to a point where it is more profitable to invest elsewhere then capital flows elsewhere...often times overseas where labor is cheaper and profit margins higher.