Wallner, W.E. 1978 Scale insects: what the arboriculturist needs to know about them.. Journal of Arboriculture 4(5): 97-103.

Notes: Species mentioned include Cryptococcus fagi, Lepidosaphes ulmi, Quadraspidiotus perniciosus, Carulaspis carueli, Phenacaspis pinifoliae, Lecanium corni, L. nigrofasciatum, Pulvinaria innumerabilis, Toumeyella liriodendri, T. pinicola, Matsucoccus resinosae and Icerya purchasi.