Cal. Food and Agricultural Code § 8769

(a) The board, annually after the organization of the district, shall assess any assessor’s parcel of real property with 10 or more olive, stone, or pome fruit trees on it and enter as a separate item, on an annual assessment roll for each assessor’s parcel of real property included in the district, the number of all olive, stone, or pome fruit trees that are growing on it. (b) For the purpose of this part, the board shall assess all olive, stone, or pome fruit acreage at a uniform value per tree. The assessment shall be upon a tree basis and the number of trees shall be determined conclusively by the board counting the trees on each assessor’s parcel. The board, in counting the olive, stone, or pome fruit trees, shall not, however, count any more than 100 trees on any one acre of land. (c) Upon completing the tree count within the district each year, the board shall separately compute and certify, to the board of supervisors, the total number of all the olive, stone, or pome fruit trees in the district on each parcel.