I. Administration and enforcement of this subdivision shall be implemented in an equitable manner throughout the state. This subdivision is of statewide concern and occupies the whole field of regulation regarding the registration, sale, transportation, or use of pesticides to the exclusion of all local regulation. Except as otherwise specifically provided in this subdivision, no ordinance or regulation of local government, including but not limited to, an action by a local governmental agency or department, a county board of commissioners or a city council, or a local regulation adopted by the use of an initiative measure, may prohibit or in any way attempt to regulate any matter relating to the registration, sale, transportation, or use of pesticides, and any of those ordinances, laws or regulations are void and of no force or effect.
II. This section shall not be construed to invalidate any ordinance or regulation of a local government in effect on the effective date of this section.