Carroll, D.P., & Luck, R.F. 1984a Within-tree distribution of California red scale, Aonidiella aurantii (Maskell) (Homoptera: Diaspididae), and its parasitoid Comperiella bifasciata Howard (Hymenoptera: Encyrtidae) on orange trees in the San Joaquin Valley.. Environmental Entomology 13: 179-183.

Notes: Scale density study conducted on 5 naval orange trees in California.