Searle, C.M., Annecke, D.P., & Wiese, I.H. 1963 Insecticides, beneficial insects, and citrus.. The South African Citrus Journal 349: 3-9.

Notes: Aonidiella aurantii, citrus red scale, is the pest around which insecticidal programmes are usually planned in all South African citrus areas. This study investigates how orchards with minimal red scale levels have attained and retained this status.