Sproul, A.N. 1981 Citrus red scale, from sprays to parasites.. Journal of Agriculture of Western Virginia 5: 50.

Notes: Some of the world's entomologists describe California red scale, Aonidiella aurantii as the most serious insect pest of citrus, and in some countries this is undoubtedly true. There was a period when it was a serious pest in Western Australia but recently its importance has declined. This decline could be attributed to the replacement of broad spectrum insecticidal sprays with a combination of parasites and the judicious application of oil sprays. Climatic conditions also are important because red scale is most severe in drier parts of the state.