Curculio occidentis, a species ofweevil in the genus Curculio, atop an acorn. Commonly known as acorn weevils or nut weevils, members of this genus infest oaks and hickories.Curculio occidentis, a species ofweevil in the genus Curculio, atop an acorn. Commonly known as acorn weevils or nut weevils, members of this genus infest oaks and hickories.