(a) Designation.--All authority vested in the secretary by virtue of the provisions of this chapter may with like force and effect be executed by such employees of the Commonwealth as the secretary may from time to time designate for said purpose.

(b) Statewide jurisdiction and preemption.--This chapter and its provisions are of Statewide concern and occupy the whole field of regulation regarding the registration, labeling, sale, storage, transportation, distribution, notification of use and use of seeds to the exclusion of all local regulations. Except as otherwise specifically provided in this chapter, no ordinance or regulation of any political subdivision or home rule municipality may prohibit or in any way attempt to regulate any matter relating to the registration, labeling, sale, storage, transportation, distribution, notification of use or use of seeds if any of these ordinances, laws or regulations are in conflict with this chapter.