Whatever we think of the Trump Administration's crackdown on illegal immigration, it bothers me to see immigrants on farms praised for doing "work Americans won't do". That phrase is an evasive way of saying "Work that plenty of Americans will do, quite eagerly, *if* you pay enough".
Is the farm work that illegal immigrants do unpleasant, exhausting, health-damaging, and low-status? Absolutely -- even Stephen Colbert has tried it and vouched in person. I bet it's even worse than working at an Amazon.com warehouse (although worse in degree, not kind). All of those are great reasons not to take work.
On the other hand,