(a) Under section 436 of the Plant Protection Act (7 U.S.C. 7756), a State or political subdivision of a State may not regulate in foreign commerce any noxious weed in order to control it, eradicate it, or prevent its dissemination. A State or political subdivision of a State also may not impose prohibitions or restrictions upon the movement in interstate commerce of noxious weeds if the Secretary has issued a regulation or order to prevent the dissemination of the noxious weed within the United States. The only exceptions to this are:
(1) If the prohibitions or restrictions issued by the State or political subdivision of a State are consistent with and do not exceed the regulations or orders issued by the Secretary; or
(2) If the State or political subdivision of a State demonstrates to the Secretary and the Secretary finds that there is a special need for additional prohibitions or restrictions based on sound scientific data or a thorough risk assessment.
(b) Therefore, in accordance with section 436 of the Plant Protection Act, the regulations in this part preempt all State and local laws and regulations that are inconsistent with or exceed the regulations in this part unless a special need request has been granted in accordance with the regulations in §§ 301.1 through 301.13 of this chapter.