Cal. Food & Agric. Code § 77551

A quorum of the commission shall be six members of whom at least five shall be producer members. Notwithstanding Section 77546, any alternate member may serve in the absence of any member if the member’s alternate is also absent and the action is necessary to establish a quorum. Except as provided in Section 77663, the vote of a majority of the members present at a meeting at which there is a quorum constitutes an act of the commission.