California Code, Food and Agricultural Code (Formerly Agricultural Code) - FAC § 6902

(a) Provide that all nursery stock shall be kept free from pests of limited distribution or pests which are not known to be established in this state and commercially clean in respect to established pests of general distribution.

(b) Prescribe methods of treatment of various types of nursery stock for control of pests.

(c) Require isolation of infested or infected nursery stock pending treatment or other disposal.

(d) Make such other provisions as are reasonably necessary to insure the relative freedom from pests of all nursery stock which is produced or sold within the state.