The impact ofOidaematophorus monodactylus(L.) on hedge bindweed (Convolvulus sepium L.) was evaluated in controlled cage experiments. Inundative releases of 3 and 5 larvae/leaf in the greenhouse caused a 90 and 100% reduction of leaves, respectively. A similar test conducted in field cages during July showed decreases in total plant length, leaf, and shoot production of hedge bindweed infested with 3 larvae/leaf. The experiment indicated that sufficiently large releases of late instars at bud formation in early June could limit growth of hedge bindweed. Although ovipositional tests showed that this plume moth had a distinct preference for hedge bindweed over sweet potato, its ability to complete development on 9 sweet potato varieties confirms that it should not be used as a control agent in areas where this crop is grown commercially.