(b)

1. (1) Five years after the date on which this subpart becomes effective, the Secretary shall conduct a referendum among producers and importers to determine whether they favor continuation, termination, or suspension of this subpart.
2. (2) Effective beginning three years after the date on which this subpart becomes effective, the Secretary, on request of a representative group comprising 30 percent or more of the number of mushroom producers and importers, may conduct a referendum to determine whether producers and importers favor termination or suspension of this subpart.

3. (3) Whenever the Secretary determines that suspension or termination of this subpart is favored by a majority of the mushroom producers and importers voting in a referendum under paragraphs (b) (1) or (2) who, during a representative period determined by the Secretary, have been engaged in producing and importing mushrooms and who, on average, annually produced and imported more than 50 percent of the volume of mushrooms produced and imported by all those producers and importers voting in the referendum, the Secretary shall:

   1. (i) Suspend or terminate, as appropriate, collection of assessments within six months after making such determination; and
   2. (ii) Suspend or terminate, as appropriate, all activities under this subpart in an orderly manner as soon as practicable.
4. (4) Referenda conducted under this subsection shall be conducted in such manner as the Secretary may prescribe.