Michelbacher, A.E., & Ortega, J.C. 1958 A technical study of insects and related pests attacking walnuts.. Bulletin (University of California, College of Agriculture, Agricultural Experiment Station) No. 764: 1-86.

Notes: Section on Homoptera (scale insects) (pp. 46-57) includes information on Lecanium pruinosum, L. corni, L. cerasorum, Lepidosaphes ulmi, Epidiaspis piricola, Diaspidiotus ancylus and Quadraspidiotus juglans; also brief mention of Saissetia oleae, Coccus pseudomagnoliarum, Lecanium kunoense and L. excrescens; descriptions and illustrations; description of damage; control techniques; natural enemies;