This chapter shall not apply to winegrapes produced for a producer’s home or ornamental use, or processed for a vintner’s home use. A producer growing winegrapes commercially on three acres or less shall be exempted from the base assessment in subdivision (a) of Section 78921. Any producer or vintner requesting an exemption from the payment of assessments shall provide an affidavit approved by the commission containing information required by the commission. The commission shall review the affidavit, conduct any additional investigation it deems appropriate, and approve or deny the exemption. If granted, the exemption shall be valid for one marketing season and a new affidavit shall be filed and approved prior to each marketing season in order to retain an exemption from this chapter.