משנה על סוטה 9:2

What constitutes a defective cluster (olelet) of grapes? Any [cluster] which has neither a shoulder [a wide upper part] nor a pendant [a cone-shaped lower part]. If it has a shoulder or a pendant, it belongs to the owner. If there is a doubt, it belongs to the poor. A defective cluster on the joint of a vine [where a normal cluster hangs from the vine], if it can be cut off with the cluster, it belongs to the owner; but if it can not, it belongs to the poor. A single grape: Rabbi Judah says: It is deemed a whole cluster, But the sages say: It is deemed a defective cluster.