Cumming, M.E.P. 1953 Notes on the life history and seasonal development of the pine needle scale Phenacaspis pinifoliae (Fitch) (Diaspididae: Homoptera).. Canadian Entomologist 85: 347-352.
Cumming, M.E.P. 1953 Notes on the life history and seasonal development of the pine needle scale Phenacaspis pinifoliae (Fitch) (Diaspididae: Homoptera).. Canadian Entomologist 85: 347-352.