I don't have the numbers handy to back it up but I would bet that the majority of illegals in this country do not pick crops. The recent cases in the news around here have been in construction, manufacturing, restaurants, meat packing and domestic help.
My wife was joking the other day that the reason so many polititians and judges are against enforcing our immigration laws is because so many of them employ domestic help who are in our country illegally. They can treat them almost like slaves, not pay minimum wage or withold taxes and there is not much they can do about it. She was just joking but I wonder.