California Growers have struggled with labor issues – well – since the Spaniards arrived!
First, farm labor was composed of the Native American Neophytes. Then, it was the Chinese. Then the Japanese, Filipinos, and Sikhs. Then, the Mexicans. Then, the Okies. Then, the Mexicans (again). Then, it was High School Students???
This is an interesting article about just one of the many labor experiments that have been attempted in an effort to secure a consistent labor force.