Smith, H.S. 1948a Quarantine and quarantine service.. The Citrus Industry. Vol. II. Production of the Crop. University of California Press Berkeley & Los Angeles 933 pp.

Notes: Scales as targets for international border searches include Aonidiella aurantii, Chrysomphalus aonidum, C. dictyospermi, Lepidosaphes beckii and Pseudococcus citri.