Fuente: WIPO "tomato" The present invention provides a reagent for detecting methyl salicylate serving as a plant hormone released when the plant is infected with a pathogen, a methyl salicylate sensor, a method for sensing methyl salicylate using the same, and a method for detecting plant pathogen infection by the same in cultivation of plants including agricultural products. A reagent for detecting methyl salicylate, containing a terbium compound, and an amine. A methyl salicylate sensor including a capture unit including the reagent and used for capturing methyl salicylate, and a detection unit detecting whether methyl salicylate is captured by the capture unit.