Cal. Food & Agric. Code § 58748

If producers or handlers of any commodity which is regulated by a marketing order or marketing agreement that is issued by the director pursuant to the provisions of this chapter are required to comply with minimum quality, condition, size, or maturity regulations, no person may, except as otherwise provided in such order or agreement, process, distribute, or otherwise handle any of such commodity from any source, whether produced within or without this state, which commodity does not meet such minimum requirements applicable upon producers or handlers of such commodity in this state. Such regulations do not, however, apply to any commodity which has been produced outside of this state and is in transit on the effective date of the regulations.