Langford, G.S., & Cory, E.N. 1939 Common insects of lawns, ornamental shrubs and shade trees.. Bulletin (University of Maryland Extension Service) 84: 3-54.

Notes: Scale species mentioned include Pulvinaria vitis, P. acericola, Eriococcus azaleae, Toumeyella liriodendri, Neolecanium cornuparvum, Lecanium sp., Aspidiotus perniciosus, Lepidosaphes ulmi, Leucaspis japonica, Chionaspis furfura, Aulacaspis rosae, Diaspis carueli, Chionaspis euonymi, Gossyparia spuria, Chrysomphalus obscurus, Chionaspis pinifoliae, Parlatoria oleae and Aulacaspis pentagona.