Except as provided in subsection (b) of this section, when conducting a covered activity on covered produce, a covered farm shall comply with the requirements of the Program. When conducting a covered activity on covered produce, a farm that has a qualified exemption shall comply with: The requirements established under 21 C.F.R. Part 112, Subparts A, O, Q, and R, as amended; and The modified requirements established under 21 C.F.R. § 112.6(b).