266.080.  Exemptions. — The provisions of sections 266.051, 266.061 and 266.071 shall not apply:

  (1)  To seed or grain not intended for seeding purposes;

  (2)  To seed in storage, or being transported or consigned to an establishment for cleaning or processing; provided, that the invoice or labeling accompanying any shipment of said seed bears the statement "seed for processing"; and provided that any labeling or other representation which may be made with respect to the uncleaned or unprocessed seed shall be subject to this law;

  (3)  To any carrier in respect to any seed transported or delivered for transportation in the ordinary course of its business as a carrier; provided, that such carrier is not engaged in producing, processing, or marketing agricultural or vegetable seed subject to the provisions of this law;

  (4)  To a farmer who sells unlabeled seed of his own production;

  (5)  To seed for use in experimental or breeding purposes, when approved by the director of agriculture on a form established by regulation.