Reference for Tevul Yom 3:1
כָּל יְדוֹת הָאֳכָלִים שֶׁהֵם חִבּוּר בְּאַב הַטֻּמְאָה, חִבּוּר בִּטְבוּל יוֹם. אֹכֶל שֶׁנִּפְרָס וּמְעֹרֶה מִקְצָת, רַבִּי מֵאִיר אוֹמֵר, אִם אוֹחֵז בַּגָּדוֹל וְהַקָּטָן עוֹלֶה עִמּוֹ, הֲרֵי הוּא כָמוֹהוּ. רַבִּי יְהוּדָה אוֹמֵר, אִם אוֹחֵז בַּקָּטָן וְהַגָּדוֹל עוֹלֶה עִמּוֹ, הֲרֵי הוּא כָמוֹהוּ. רַבִּי נְחֶמְיָה אוֹמֵר, בַּטָּהוֹר. וַחֲכָמִים אוֹמְרִים, בַּטָּמֵא. וּשְׁאָר כָּל הָאֳכָלִים, אֶת שֶׁדַּרְכּוֹ לֵאָחֵז בֶּעָלֶה, אוֹחֵז אוֹתוֹ בֶּעָלֶה. וּבַקֶּלַח, אוֹחֲזִין אוֹתוֹ בַּקָּלַח:
All [stalks of fruits] that serve as handles for the food, those that are considered connected regarding [being touched by] an Origin of impurity, are [also] considered connected regarding a <i>tevul yom</i> [one who has immersed that day in a <i>mikvah</i>, but who must wait until nightfall to become fully pure, and is of a second degree impurity until then]. Food which was sliced, but is attached by a small part, Rabbi Meir says: if one holds the larger part and the smaller part comes up with it, it is thereby like it [i.e. and is considered connected to it with regard to impurity]. Rabbi Yehuda says: if one holds the smaller part and the greater part comes up with it, it is thereby like it. Rabbi Nechemia says: [this rule applies] regarding the pure part [i.e. if one holds the part which was not touched by the <i>tevul yom</i>, all that comes up with it is considered connected]. And the Sages say: [this rule applies] regarding the impure part. And regarding all other foods, those usually held by the leaf should be held by the leaf, and [those usually held] by the stalk should be held by the stalk [and if the food does not fall, it is considered connected].