CA Food & Agric Code Section 6923

Except as otherwise provided in Section 6502 or Section 6506, it is unlawful for any person to sell, deliver, or transport from one locality to another locality within the same county any nursery stock which the commissioner considers and designates to be liable to be infested with any pest, unless he has affixed to such nursery stock in a conspicuous place one of the following:

(a)

A shipping permit that warns that inspection at destination is required.

(b)

A valid nursery stock certificate issued by the commissioner of the county which gives notice that inspection at destination is not required.