http://business.mainetoday.com/news/061001fritzsche.html
That article is inaccurate. Which is likely why he doesn't cite any references, or anything for that matter.
If you have any sort of work ethic, you can make twice minimum wage in blueberry, potato, or broccoli fields here. If you have a strong work ethic, you can do even better. Folks who aren't getting paid well are the ones who spend most of their time in the fields socializing rather than producing or folks who are using it as an excuse to take a short vacation and spend more time at the mall than in the fields.
Apple picking will get you minimum wage, maybe a little better. Maple syrup will get you minimum wage but there's not much demand for a work-force.
Lumber work will get you twice minimum wage.
Ocean harvests will get you better than minimum wage, easily, as long as you get your butt on a boat and have a strong work ethic. Blood worms and clams aren't producing the same numbers as they were in past years, so shore work has been hit. Not sure what you'll make going after those two this year.
Oh, and "animal farming" makes lots of Mainers good money every hunting season.