Code of Federal Regulations Title 7. Agriculture § 7.301.1 Purpose and scope

(a) Under section 436 of the Plant Protection Act (7 U.S.C. 7756), a State or political subdivision of a State may not impose prohibitions or restrictions upon the movement in interstate commerce of articles, means of conveyance, plants, plant products, biological control organisms, plant pests, or noxious weeds if the Secretary has issued a regulation or order to prevent the dissemination of the biological control organism, plant pest, or noxious weed within the United States. The only exceptions to this are:

(b) The regulations in this subpart provide for the submission and consideration of special need requests when a State or a political subdivision of a State seeks to impose prohibitions or restrictions on the movement in interstate commerce of articles, means of conveyance, plants, plant products, biological control organisms, plant pests, or noxious weeds that are in addition to the prohibitions or restrictions imposed by this part or by a Federal Order.