Notwithstanding any other provisions of this subchapter:(1) Once a lien is perfected and attaches in accordance with §80.017 of the Code, the lien established will be solely against citrus producers and first buyers of citrus, as defined by §27.101 of this title (relating to Definitions), and will be subject to and preempted by the Food Security Act of 1985 (7 USCA §1631), and the lien notice provisions thereof to first buyers of citrus, to be given by the Corporation.(2) The lien established by §80.017 is not effective or enforceable against a first buyer of citrus until the written notice described in paragraph (1) of this section is received by the buyer.