Gerson, U. 1990 1.1.4.5 Biosystematics.. Armored Scale Insects, Their Biology, Natural Enemies and Control [Series title: World Crop Pests, Vol. 4A]. Elsevier Amsterdam, The Netherlands 384 pp.

Notes: Three relevant case histories are presented which show various aspects of the taxonomic dilemmas caused by the morphology of uniparental and biparental populations. Abgrallaspis cyanophylli, Aspidiotus nerii and Lepidosaphes ulmi).