NPR: Spanish Immigration Ploy: Hire Mothers
In order to aquire agricultural laborers without encouraging illegal immigration, Spanish farmowners have begun a guest worker program which targets Moroccan mothers in order to pick fruit. In general, they don't drink, don't smoke, or go go to the discos and when the work is done they will have a strong incentive to go back home. This is in contrast to "las rubias" (the blondes) from Eastern Europe who tended to spice up the local nightlife for young Spanish men.
Spiegel Online International: Moroccan Immigrants, Spanish Strawberries and Europe's Future by Daniela Gerson in Cartaya, Spain