Cal. Food & Agr. Code § 6293.10
At the hearing, any owner of winegrape growing acreage in the proposed district may present to the board of supervisors a request 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 is not planted to winegrapes and will not be so planted in the foreseeable future. However, should the excluded land be planted to winegrapes, the landowner shall be required to inform the district, in writing, within 30 days of planting. 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 § 6293.10