Whenever producers or handlers of an agricultural commodity regulated by a marketing order issued by any commission pursuant to this article are required to comply with minimum quality, condition, size, or maturity regulations, no person, except as otherwise provided in such order, shall process, distribute, or otherwise handle any of such agricultural commodity from any source, whether produced within or without this state, which commodity does not meet such minimum requirements applicable to producers or handlers of such commodity in this state, provided that such regulations shall not apply to any commodity which has been produced outside of this state and is in transit on the effective date of the regulations.