Cal. Food & Agric. Code § 59851

Upon the issuance of a marketing program for the written assent of producers, the director shall submit a copy of the marketing program in full to each of the producers of the commodity which is to be affected, or their duly authorized agent, within the proposed proration zone as shown by the lists of producers which are compiled in accordance with this chapter, accompanied by a printed, typewritten, or mimeographed form upon which the producer can record his assent to the marketing program.