Hewitt, C.G. 1915 Report of the Division of Entomology.. Sessional Paper (Division of Entomology, Canada Dept. of Agr.) No. 16: 853-876.
Notes: Scales mentioned include Gossyparia spuria, a threat to elms.
Hewitt, C.G. 1915 Report of the Division of Entomology.. Sessional Paper (Division of Entomology, Canada Dept. of Agr.) No. 16: 853-876.
Notes: Scales mentioned include Gossyparia spuria, a threat to elms.