Reference for Pesachim 112:8

כל שהוא אוכל פרט לספיחי סטיס וקוצה ונשמר פרט להפקר וגידולו מן הארץ פרט לכמהין ופטריות ולקיטתן כאחת פרט לתאנים ומכניסו לקיום פרט לירק

place are permitted now that they have fallen to earth, for since none grow there, there was never any fear that he might go up and cut off the growing dates. - Though this explanation removes several difficulties, Tosaf. observes that it raises a practical difficulty: how is one to distinguish between those which fell down before the Festival and those which fell on the Festival itself, and those which had fallen on the upper branches in the first place and those which had first fallen on the lower branches?

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