Kozár, F., & Konstantinova, G.M. 1981a San José scale in deciduous fruit orchards of some European countries (Survey of scale insect infestations in European orchards No. IV).. EPPO (European and Mediterranean Plant Protection Organization) Bulletin 11(2): 127-133.

Notes: Quadraspidiotus perniciosus; host; distribution maps showing degree of density on different hosts; mentions 24 other coccoid species.