Leafy spurge hawkmoth (Hyles euphorbiae) is a large exotic moth. It is native to Europe and western Asia. In the 1960s it was introduced into the United States to control leafy spurge, and separately into Canada to control leafy and cypress spurges. Hawkmoth populations are never large due to predation and disease, and they are susceptible to insecticides used to control grasshoppers. While the larvae can entirely defoliate a host plant, the damage to the host plant population is never significant.
Since its introduction, leafy spurge hawkmoth has spread widely and its range continues to expand. It now occurs in the northern United States and southern Canada east of the Rocky Mountains. It is found from late May through July in disturbed meadows and other grasslands with large populations of leafy spurge. Larvae feed on the foliage of leafy spurge and other members of the Euphorbiaceae (spurge) family. Adults feed on flower nectar. They hover like a hummingbird when visiting flowers.
Leafy spurge hawkmoth is identified by its large size; pale tan forewings with a slight pinkish tinge; a squarish, olive-brown spot in the basal area and another in the median area; an olive-brown post-medial band; and black peppering in the pale areas.