Fuente: WIPO "tomato" An object of the present invention is to discover a novel gene that causes a difference in resistance between the plant-parasitic-nematode-resistant rice variety ARC10313 and the plant-parasitic nematode-susceptible rice variety T65 to provide an agent based on the novel gene for controlling a plant-parasitic nematode. Provided is an agent for controlling a plant-parasitic nematode, consisting of a polypeptide or a fragment thereof comprising any amino acid sequence shown in (a) the amino acid sequence of SEQ ID NO: 13, (b) an amino acid sequence in which one or multiple amino acids are deleted, substituted, or added in the amino acid sequence of SEQ ID NO: 13, or (c) an amino acid sequence having 90% or more identity with the amino acid sequence of SEQ ID NO: 13.