199.13A  Local legislation — prohibition.
  1.  The provisions of this chapter and rules adopted by the department pursuant to this chapter shall preempt local legislation adopted by a local governmental entity relating to the production, use, advertising, sale, distribution, storage, transportation, formulation, packaging, labeling, certification, or registration of an agricultural seed. A local governmental entity shall not adopt or continue in effect such local legislation regardless of whether a statute or a rule adopted by the department specifically preempts the local legislation. Local legislation in violation of this section is void and unenforceable.
  2.  This section does not apply to any of the following:
  a.  Local legislation of general applicability to commercial activity.
  b.  A motion or resolution that provides for any activity relating to agricultural seed which is owned by the local governmental entity and which is kept or used on land held by the local governmental entity.
2005 Acts, ch 21, §3