Except as otherwise provided in Section 6502, 6504, 6506, or 6924, it is unlawful for any person to receive or bring into any county or locality of the state from another county or locality within the state any nursery stock, or any other plant, appliance, or thing subject to a federal or state quarantine or which the commissioner or the director considers and designates to be liable to be infected or infested with any pest, unless the person does all of the following:

Any shipment of less than five pounds of agricultural, vegetable, or flower seed, or comprised of packages of less than three pounds of each kind of such seed, is exempt from the requirements of this article. The shipping permit which would be required by Article 2 (commencing with Section 6921), Chapter 2, Part 3, of this division for such a shipment may be waived by the commissioner.

Except as provided in Sections 6505, 6506, and 6923 any shipment of nursery stock which is moved from one county or locality to another county or locality which is accompanied by a valid nursery stock certificate or is sold at retail and delivered to the purchaser at a licensed sales location as provided in Section 6924 is exempt from the requirements of this article

The commissioner may waive the exemption in Section 6504 by written notice to the director designating the kind of nursery stock, and the pest that may be transmitted thereby, which shall be held for inspection as provided in Section 6501, upon arrival in the county or locality described in the notice.

Any shipment of seed from an origin inspected warehouse is exempt from the requirements of this article.