Samways, M.J. 1985 Relationship between red scale, Aonidiella aurantii (Maskell) (Hemiptera: Diaspididae), and its natural enemies in the upper and lower parts of citrus trees in South Africa.. Bulletin of Entomological Research 75: 379-393.

Notes: Abstract: Aphytis, natural enemy of A. aurantii, not effective at upper level (crown) of Valencia orange trees (mostly adult females); Chilocorus nigritus introduced to attack adult stage; also chemical control used. Keywords: biological control.