Cal. Food & Agr. Code § 6220
At the hearing, any owner of winegrape acreage in the proposed district may present to the board of supervisors a request, in writing, for the exclusion of that land or any part of that land from the proposed district upon a showing that the land or part of that land will not be benefited by the activities of the proposed district. Factors that the board of supervisors may consider in its determination to exclude shall include an affidavit from the landowner stating that the land has already been affected by phylloxera or other winegrape plant pests or diseases and the winegrape plants have been removed from the land, that more than 66 percent of the subject parcel is planted with non-vinifera-crossed rootstock, including, but not limited to, St. George, S04, 5C, or 5BB rootstock, or that the subject parcel does not have a pest or disease problem that can be controlled by the district. Any owner of winegrape acreage outside the proposed district may present to the board of supervisors a request in writing for inclusion of that land in the proposed district.
Ca. Food and Agric. Code § 6220