Quednau, F.W., & Annecke, D.P. 1963 Biological control of citrus red scale.. The South African Citrus Journal No. 357: 11-18.

Notes: Historical perspective of biological control experiments on Icerya purchasi, Pseudococcus gahani and Saissetia oleae; description of project at Pretoria using Aphytis chrysomphali and Aphytis africanus to control Aonidiella aurantii.