McClure, M.S. 1983c Competition between herbivores and increased resource heterogeneity.. Variable Plants and Herbivores in Natural and Managed Systems. Academic Press New York 717 pp.

Notes: Among the species discussed are Carulaspis minima, Fiorinia externa, Icerya seychellarum, Lepidosaphes newsteadi, Tsugaspidiotus canadensis and T. tsugae.