Cal. Food & Agric. Code § 74693

(a) Upon a finding by a two-thirds vote of the commission that this chapter has not tended to effectuate its declared purposes, the commission may recommend to the director that this chapter be suspended.
(b) Alternatively, the director may be petitioned to suspend this chapter. The petition shall be signed by 20 percent of the vintners by number who processed not less than 20 percent of the volume of winegrapes in the immediately preceding marketing season. The director shall hold a hearing on the petition after receiving it.
(c) The director shall, upon receipt of the recommendation to suspend this chapter from the commission, or may, after holding the hearing on the petition to suspend this chapter, hold a referendum among the vintners to determine if the commission shall be suspended. However, the director shall not hold a referendum as a result of the petition unless the petitioner shows by the weight of evidence that this chapter has not tended to effectuate its declared purposes.
(d) The director shall establish a referendum period, which shall not be less than 10 days nor more than 60 days in duration. The director may prescribe additional procedures as may be necessary to conduct the referendum. At the close of the referendum period, the director shall tabulate the ballots filed during the period. If at least 40 percent of the total number of vintners from the list established by the director participate in the referendum, the director shall suspend this chapter if he or she finds either of the following has occurred:
1. (1) Sixty-five percent or more of the vintners who voted in the referendum, voted in favor of suspension; and the vintners so voting processed a majority of the total quantity of winegrapes processed in the preceding marketing season by all of the vintners who participated in the referendum.
2. (2) A majority of the vintners who voted in the referendum voted in favor of suspension; and the vintners so voting processed 65 percent or more of the total quantity of winegrapes processed in the preceding marketing season by all of the vintners who voted in the referendum.