Stimmel, J.F. 1980b Oystershell scale, Lepidosaphes ulmi (Linnaeus) (Homoptera: Diaspididae).. Regulatory Horticulture (Pennsylvania Department of Agriculture) 6(1): 17-18 (Ent. Circ. No. 49).

Notes: Hosts, distribution, identification, life history, damage, and control of this common pest of ornamentals.