Steyn, J.J. 1955 The effect of mixed ant populations on red scale (Aonidiella aurantii Mask.) on citrus at Letaba.. Journal of the Entomological Society of Southern Africa 18(1): 93-105.

Notes: Aonidiella aurantii was kept under adequate commercial control by its natural enemies in certain plots which adjoined some of the most heavily scale-infested plots. These "natural control" plots had not been treated with red scale insecticides for a number of years, and they only differed from the scaly plots with their pure or almost pure populations of either Pheidole megacephala or Anoplolepis custodiens, in having mixed populations of several species of ants.