The butternut curculio, Conotrachelus juglandis LeConte (Coleoptera: Curculionidae), injures the shoots and nuts of various species and hybrids of Juglans in eastern North America This insect was described in 1876 (LeConte, 1876); its life history has been studied in Connecticut (Britton and Kirk, 1912) and in West Virginia (Brooks, 1922). Its range, however, extends from the New England states through southern Canada to the Great Plains and south to Kansas, Alabama, and Georgia, contiguous with the natural range of butternut (J. cinema), its native host.
Corneil, Jeffrey A. and Wilson, Louis F.
"Life History of the Butternut Curculio, Conotrachelus Juglandis (Coleoptera: Curculionidae), in Michigan,"
The Great Lakes Entomologist, vol 12
Available at: https://scholar.valpo.edu/tgle/vol12/iss1/2