This chapter, except as necessary to conduct an implementation referendum vote, shall not become operative until the director finds, in a referendum vote conducted by the director that at least 40 percent of the total number of grape rootstock nurseries from the list established by the director pursuant to this article have participated and that either of the following has occurred:
(a) Sixty-five percent of the nurseries that voted in the referendum voted in favor of this chapter, and the nurseries so voting marketed a majority of the total quantity of grape rootstock in the preceding marketing year by all of the nurseries that voted in the referendum.
(b) A majority of the grape rootstock nurseries that voted in the referendum voted in favor of this chapter, and the nurseries so voting marketed 65 percent or more of the total quantity of grape rootstock in the preceding marketing year by all of the nurseries that voted in the referendum.