de Freitas, A. 1962 Distribuicao e hospedeiros da cochonilha-de-Sao-Jose (Quadraspidiotus perniciosus (Comst.)) em Portugal continental. [The distribution and hosts of San José scale (Quadraspidiotus perniciosus (Comst.)) in continental Portugal.]. Agronomia Lusitana 24: 21-32.

Notes: A list of the recognized and potential host plants of this pest is also included.