Related for Avodah Zarah 131:1

חמרא עתיקא בענבי דברי הכל בנותן טעם חמרא חדתא בענבי אביי אמר במשהו ורבא אמר בנותן טעם

Old wine [which falls] upon grapes, all agree that [they are prohibited, if] it imparts a flavor. New wine [which falls] upon grapes, Abaye said that [they are prohibited] however small the quantity but Rava said that it must impart a flavor.

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