In the previous Halachot we have established that when any species of Shevi’it produce is no longer available in the field, one must eliminate it from one’s home (by means of Hefker).

Fruits Whose Time for Elimination Has Already Arrived But Have Not Yet Been Eliminated
The Baraita (Yoma 83a) states that once the time to eliminate Shevi’it produce arrives, one may not partake of these fruits. Hagaon Chazon Ish (Shevi’it, Chapter 11, Subsection 6) explains that this prohibition is self-understood, for since the Torah has commanded that these fruits be eliminated, if the time has come and one has not yet eliminated them, it becomes forbidden to consume them.

Nevertheless, the Sefer Charedim (Chapter 55) understands from the words of the Ramban that the prohibition to consume Shevi’it fruits whose time for elimination has already passed and have not been eliminated applies…