This chapter, except as necessary to conduct an implementation referendum, does not become operative until the director finds in a referendum conducted by the director, or a person designated by the director, that at least 40 percent of the total number of producers from the list established by the director pursuant to Section 73201, participated, and that he or she finds either one of the following:
(a)
Sixty-five percent or more of the producers who voted in the referendum voted in favor of this chapter, and the producers so voting marketed a majority of the volume of navel oranges in the preceding season by all of the producers who voted in the referendum.
(b)
A majority of the producers who voted in the referendum voted in favor of this chapter, and the producers so voting marketed 65 percent or more of the volume of navel oranges in the preceding season by all of the producers who voted in the referendum.