Abbas, M.S.T. 1992 Comparative rates of infestation by four scale insects on citrus trees with special reference to rates of parasitism on the purple scale Lepidsosaphes beckii.. Egyptian Journal of Agricultural Research 70: 477-485.

Notes: Lepidosaphes beckii and Ceroplastes floridensis are the two most important species on citrus in Egypt; Chrysomphalus ficus and Aonidiella aurantii also discussed.