Obscure root weevil(Sciopithes obscurusHorn) feeding stimulants can be obtained from leaf tissue of theRhododendroncv. Cynthia(R. catawbienseMichaux ×R. griffithianumWight). Exhaustive ethanolic extraction, followed by solvent partitioning against hexanes and thin-layer chromatography of the ethanolic and hexanes fractions, yields three components with phagostimulatory activity in a membrane filter insect feeding bioassay. Sucrose, one of the obscure root weevil feeding stimulants present in the leaves of ‘Cynthia’, is more potent in the insect feeding bioassay than several other simple carbohydrates.