McClure, M.S. 1985 Patterns of abundance, survivorship, and fecundity of Nuculaspis tsugae (Homoptera: Diaspididae) on Tsuga species in Japan in relation to elevation.. Environmental Entomology 14: 413-415.

Notes: Hosts; density, survivorship and fecundity were significantly greater at the edges of natural distribution and at low elevation cultivated sites than at any of the natural montane sites.