Not a chance. When you're paying a couple bucks a pound for fresh ______, it didn't take 15 minutes of a migrant worker's time to plant/pick/care/pack that pound.
My guess is that the migrant worker proportion of retail cost is <10%. Quadrupling their income would increase retail cost by 30%.
edit:
> What would happen to consumer food costs if farm wages rose and the extra costs were passed on to consumers? The average earnings of field workers were $9.78 an hour in 2008, according to a U.S. Department of Agriculture survey of farm employers, and a 40 percent increase would raise them to $13.69 an hour. If this wage increase were passed on to consumers, the 10 cent farm labor cost of a $1 pound of apples would rise to 14 cents, and the retail price would only rise to $1.04.