Herrick, G.W. 1925 . Manual of Injurious Insects. Henry Holt New York 489 pp.

Notes: Scale insects include Aspidiotus ancylus, A. forbesi, A. hederae, A. howardi, A. ostreaeformis, A. perniciosus, A. uvae, Chrysomphalus aonidum, C. aurantii, Coccus citricola, C. hesperidum, Icerya purchasi, Pseudococcus adonidum, P. calceolariae, P. citri, P. citrophilus, P. longispinus, P. maritimus, P. nipae, Saissetia hemisphaerica and S. oleae.