Ördögh, G. 1995 Morphology of nymphs and biology of Rhodococcus perornatus (Cockerell and Parrott) (Homoptera: Coccidae) in Hungary.. Israel Journal of Entomology 29: 93-96.

Notes: R. perornatus was formerly known as a rare, steppe-inhabiting, mesophilous species in the Palaeractic region; however, in recent years it is becoming a pest of cultivated roses in Hungary, mainly in the Budapest region; biology; description and illustration of nymphs.